diff --git a/.travis.yml b/.travis.yml
index f824806..f13493a 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,9 +7,11 @@ php:
   - 5.6
   - hhvm
   - 7
+  - 7.1
+  - 7.2
 
 before_script:
   - composer self-update
-  - composer install --prefer-source
+  - composer install
 
-script: phpunit --coverage-text
+script: vendor/bin/phpunit --coverage-text
diff --git a/composer.json b/composer.json
index 4552d57..1e90e16 100644
--- a/composer.json
+++ b/composer.json
@@ -11,8 +11,8 @@
     ],
     "require": {
         "php": ">=5.3.0",
-        "symfony/http-foundation": "~2.1|~3.0",
-        "symfony/http-kernel": "~2.1|~3.0"
+        "symfony/http-foundation": "~2.1|~3.0|~4.0",
+        "symfony/http-kernel": "~2.1|~3.0|~4.0"
     },
     "autoload": {
         "psr-0": { "Stack": "src" }
@@ -21,6 +21,6 @@
         "branch-alias": { "dev-master": "1.0-dev" }
     },
     "require-dev": {
-        "phpunit/phpunit": "^5.2"
+        "phpunit/phpunit": "~5.5"
     }
 }
diff --git a/composer.lock b/composer.lock
index 979ced8..5d3c132 100644
--- a/composer.lock
+++ b/composer.lock
@@ -1,28 +1,37 @@
 {
     "_readme": [
         "This file locks the dependencies of your project to a known state",
-        "Read more about it at http://getcomposer.org/doc/01-basic-usage.md#composer-lock-the-lock-file"
+        "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
+        "This file is @generated automatically"
     ],
-    "hash": "981cc271aabda6a421a78b8c234fb7bc",
+    "content-hash": "c33f1df9487cf9269218d943c625d283",
     "packages": [
         {
             "name": "psr/log",
-            "version": "1.0.0",
+            "version": "1.0.2",
             "source": {
                 "type": "git",
                 "url": "https://github.com/php-fig/log.git",
-                "reference": "fe0936ee26643249e916849d48e3a51d5f5e278b"
+                "reference": "4ebe3a8bf773a19edfe0a84b6585ba3d401b724d"
             },
             "dist": {
                 "type": "zip",
-                "url": "https://api.github.com/repos/php-fig/log/zipball/fe0936ee26643249e916849d48e3a51d5f5e278b",
-                "reference": "fe0936ee26643249e916849d48e3a51d5f5e278b",
+                "url": "https://api.github.com/repos/php-fig/log/zipball/4ebe3a8bf773a19edfe0a84b6585ba3d401b724d",
+                "reference": "4ebe3a8bf773a19edfe0a84b6585ba3d401b724d",
                 "shasum": ""
             },
+            "require": {
+                "php": ">=5.3.0"
+            },
             "type": "library",
+            "extra": {
+                "branch-alias": {
+                    "dev-master": "1.0.x-dev"
+                }
+            },
             "autoload": {
-                "psr-0": {
-                    "Psr\\Log\\": ""
+                "psr-4": {
+                    "Psr\\Log\\": "Psr/Log/"
                 }
             },
             "notification-url": "https://packagist.org/downloads/",
@@ -36,50 +45,51 @@
                 }
             ],
             "description": "Common interface for logging libraries",
+            "homepage": "https://github.com/php-fig/log",
             "keywords": [
                 "log",
                 "psr",
                 "psr-3"
             ],
-            "time": "2012-12-21 11:40:51"
+            "time": "2016-10-10T12:19:37+00:00"
         },
         {
             "name": "symfony/debug",
-            "version": "v2.3.6",
-            "target-dir": "Symfony/Component/Debug",
+            "version": "v4.1.2",
             "source": {
                 "type": "git",
-                "url": "https://github.com/symfony/Debug.git",
-                "reference": "7f671456b9617d0a54f04597ae1c1ed3a1e858fd"
+                "url": "https://github.com/symfony/debug.git",
+                "reference": "a1f2118cedb8731c45e945cdd2b808ca82abc4b5"
             },
             "dist": {
                 "type": "zip",
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-                "reference": "7f671456b9617d0a54f04597ae1c1ed3a1e858fd",
+                "url": "https://api.github.com/repos/symfony/debug/zipball/a1f2118cedb8731c45e945cdd2b808ca82abc4b5",
+                "reference": "a1f2118cedb8731c45e945cdd2b808ca82abc4b5",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.3.3"
+                "php": "^7.1.3",
+                "psr/log": "~1.0"
             },
-            "require-dev": {
-                "symfony/http-foundation": "~2.1",
-                "symfony/http-kernel": "~2.1"
+            "conflict": {
+                "symfony/http-kernel": "<3.4"
             },
-            "suggest": {
-                "symfony/class-loader": "",
-                "symfony/http-foundation": "",
-                "symfony/http-kernel": ""
+            "require-dev": {
+                "symfony/http-kernel": "~3.4|~4.0"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "2.3-dev"
+                    "dev-master": "4.1-dev"
                 }
             },
             "autoload": {
-                "psr-0": {
+                "psr-4": {
                     "Symfony\\Component\\Debug\\": ""
-                }
+                },
+                "exclude-from-classmap": [
+                    "/Tests/"
+                ]
             },
             "notification-url": "https://packagist.org/downloads/",
             "license": [
@@ -92,33 +102,39 @@
                 },
                 {
                     "name": "Symfony Community",
-                    "homepage": "http://symfony.com/contributors"
+                    "homepage": "https://symfony.com/contributors"
                 }
             ],
             "description": "Symfony Debug Component",
-            "homepage": "http://symfony.com",
-            "time": "2013-09-19 09:47:13"
+            "homepage": "https://symfony.com",
+            "time": "2018-07-06T14:52:28+00:00"
         },
         {
             "name": "symfony/event-dispatcher",
-            "version": "v2.3.6",
-            "target-dir": "Symfony/Component/EventDispatcher",
+            "version": "v4.1.2",
             "source": {
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-                "url": "https://github.com/symfony/EventDispatcher.git",
-                "reference": "7fc72a7a346a1887d3968cc1ce5642a15cd182e9"
+                "url": "https://github.com/symfony/event-dispatcher.git",
+                "reference": "00d64638e4f0703a00ab7fc2c8ae5f75f3b4020f"
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-                "reference": "7fc72a7a346a1887d3968cc1ce5642a15cd182e9",
+                "url": "https://api.github.com/repos/symfony/event-dispatcher/zipball/00d64638e4f0703a00ab7fc2c8ae5f75f3b4020f",
+                "reference": "00d64638e4f0703a00ab7fc2c8ae5f75f3b4020f",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.3.3"
+                "php": "^7.1.3"
+            },
+            "conflict": {
+                "symfony/dependency-injection": "<3.4"
             },
             "require-dev": {
-                "symfony/dependency-injection": "~2.0"
+                "psr/log": "~1.0",
+                "symfony/config": "~3.4|~4.0",
+                "symfony/dependency-injection": "~3.4|~4.0",
+                "symfony/expression-language": "~3.4|~4.0",
+                "symfony/stopwatch": "~3.4|~4.0"
             },
             "suggest": {
                 "symfony/dependency-injection": "",
@@ -127,13 +143,16 @@
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "2.3-dev"
+                    "dev-master": "4.1-dev"
                 }
             },
             "autoload": {
-                "psr-0": {
+                "psr-4": {
                     "Symfony\\Component\\EventDispatcher\\": ""
-                }
+                },
+                "exclude-from-classmap": [
+                    "/Tests/"
+                ]
             },
             "notification-url": "https://packagist.org/downloads/",
             "license": [
@@ -146,43 +165,47 @@
                 },
                 {
                     "name": "Symfony Community",
-                    "homepage": "http://symfony.com/contributors"
+                    "homepage": "https://symfony.com/contributors"
                 }
             ],
             "description": "Symfony EventDispatcher Component",
-            "homepage": "http://symfony.com",
-            "time": "2013-09-19 09:45:20"
+            "homepage": "https://symfony.com",
+            "time": "2018-07-10T11:02:47+00:00"
         },
         {
             "name": "symfony/http-foundation",
-            "version": "v2.3.6",
-            "target-dir": "Symfony/Component/HttpFoundation",
+            "version": "v4.1.2",
             "source": {
                 "type": "git",
-                "url": "https://github.com/symfony/HttpFoundation.git",
-                "reference": "59e712338cd05463ebcb8da6422a01b1291871e3"
+                "url": "https://github.com/symfony/http-foundation.git",
+                "reference": "8da9ea68ab2d80dfabd41e0d14b9606bb47a10c0"
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-                "reference": "59e712338cd05463ebcb8da6422a01b1291871e3",
+                "url": "https://api.github.com/repos/symfony/http-foundation/zipball/8da9ea68ab2d80dfabd41e0d14b9606bb47a10c0",
+                "reference": "8da9ea68ab2d80dfabd41e0d14b9606bb47a10c0",
                 "shasum": ""
             },
             "require": {
-                "php": ">=5.3.3"
+                "php": "^7.1.3",
+                "symfony/polyfill-mbstring": "~1.1"
+            },
+            "require-dev": {
+                "predis/predis": "~1.0",
+                "symfony/expression-language": "~3.4|~4.0"
             },
             "type": "library",
             "extra": {
                 "branch-alias": {
-                    "dev-master": "2.3-dev"
+                    "dev-master": "4.1-dev"
                 }
             },
             "autoload": {
-                "psr-0": {
+                "psr-4": {
                     "Symfony\\Component\\HttpFoundation\\": ""
                 },
-                "classmap": [
-                    "Symfony/Component/HttpFoundation/Resources/stubs"
+                "exclude-from-classmap": [
+                    "/Tests/"
                 ]
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             "notification-url": "https://packagist.org/downloads/",
@@ -196,65 +219,81 @@
                 },
                 {
                     "name": "Symfony Community",
-                    "homepage": "http://symfony.com/contributors"
+                    "homepage": "https://symfony.com/contributors"
                 }
             ],
             "description": "Symfony HttpFoundation Component",
-            "homepage": "http://symfony.com",
-            "time": "2013-09-29 19:41:41"
+            "homepage": "https://symfony.com",
+            "time": "2018-07-16T14:05:40+00:00"
         },
         {
             "name": "symfony/http-kernel",
-            "version": "v2.3.6",
-            "target-dir": "Symfony/Component/HttpKernel",
+            "version": "v4.1.2",
             "source": {
                 "type": "git",
-                "url": "https://github.com/symfony/HttpKernel.git",
-                "reference": "9ace7b963fa6d2eae8471c246e6fabc2ef714566"
+                "url": "https://github.com/symfony/http-kernel.git",
+                "reference": "ebd28f4f88a2ca0a0488882ad73c4004f3afdbe3"
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-                "reference": "9ace7b963fa6d2eae8471c246e6fabc2ef714566",
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-                "symfony/debug": "~2.3",
-                "symfony/event-dispatcher": "~2.1",
-                "symfony/http-foundation": "~2.2"
+                "symfony/debug": "~3.4|~4.0",
+                "symfony/event-dispatcher": "~4.1",
+                "symfony/http-foundation": "^4.1.1",
+                "symfony/polyfill-ctype": "~1.8"
+            },
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+                "symfony/dependency-injection": "<4.1",
+                "symfony/var-dumper": "<4.1.1",
+                "twig/twig": "<1.34|<2.4,>=2"
+            },
+            "provide": {
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-                "symfony/class-loader": "~2.1",
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-                "symfony/routing": "~2.2",
-                "symfony/stopwatch": "~2.2",
-                "symfony/templating": "~2.2"
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+                "symfony/browser-kit": "~3.4|~4.0",
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+                "symfony/console": "~3.4|~4.0",
+                "symfony/css-selector": "~3.4|~4.0",
+                "symfony/dependency-injection": "^4.1",
+                "symfony/dom-crawler": "~3.4|~4.0",
+                "symfony/expression-language": "~3.4|~4.0",
+                "symfony/finder": "~3.4|~4.0",
+                "symfony/process": "~3.4|~4.0",
+                "symfony/routing": "~3.4|~4.0",
+                "symfony/stopwatch": "~3.4|~4.0",
+                "symfony/templating": "~3.4|~4.0",
+                "symfony/translation": "~3.4|~4.0",
+                "symfony/var-dumper": "^4.1.1"
             },
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-                "symfony/class-loader": "",
                 "symfony/config": "",
                 "symfony/console": "",
                 "symfony/dependency-injection": "",
-                "symfony/finder": ""
+                "symfony/var-dumper": ""
             },
             "type": "library",
             "extra": {
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-                    "dev-master": "2.3-dev"
+                    "dev-master": "4.1-dev"
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             "autoload": {
-                "psr-0": {
+                "psr-4": {
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-                }
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@@ -267,28 +306,1466 @@
                 },
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-                    "homepage": "http://symfony.com/contributors"
+                    "homepage": "https://symfony.com/contributors"
                 }
             ],
             "description": "Symfony HttpKernel Component",
-            "homepage": "http://symfony.com",
-            "time": "2013-10-10 13:24:22"
+            "homepage": "https://symfony.com",
+            "time": "2018-07-23T17:16:22+00:00"
+        },
+        {
+            "name": "symfony/polyfill-ctype",
+            "version": "v1.8.0",
+            "source": {
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+                "url": "https://github.com/symfony/polyfill-ctype.git",
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+            "license": [
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+                    "homepage": "https://symfony.com/contributors"
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+                    "email": "BackEndTea@gmail.com"
+                }
+            ],
+            "description": "Symfony polyfill for ctype functions",
+            "homepage": "https://symfony.com",
+            "keywords": [
+                "compatibility",
+                "ctype",
+                "polyfill",
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+            "version": "v1.8.0",
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