change support version of node

Author: horike37

.travis.yml

@@ -2,10 +2,10 @@ language: node_js
 
 matrix:
   include:
-    - node_js: '4.4'
-    - node_js: '5.11'
-    - node_js: '6.2'
     - node_js: '6.2'
+    - node_js: '8.9'
+    - node_js: '10.6'
+    - node_js: '10.6'
       env:
         - DISABLE_TESTS=true
         - LINTING=true
@@ -20,4 +20,4 @@ script:
   - if [[ ! -z "$DISABLE_TESTS" && ! -z "$LINTING" ]]; then npm run lint; fi
 
 after_success:
-  - cat ./coverage/lcov.info | ./node_modules/coveralls/bin/coveralls.js && rm -rf ./coverage
+  - cat ./coverage/lcov.info | ./node_modules/coveralls/bin/coveralls.js && rm -rf ./coverage

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "serverless-step-functions",
-  "version": "1.10.0",
+  "version": "1.11.0",
   "description": "The module is AWS Step Functions plugin for Serverless Framework",
   "main": "lib/index.js",
   "scripts": {