diff --git a/Chapter07/gamestore/Pipfile.lock b/Chapter07/gamestore/Pipfile.lock
index daf8ee9..35f97e3 100644
--- a/Chapter07/gamestore/Pipfile.lock
+++ b/Chapter07/gamestore/Pipfile.lock
@@ -3,19 +3,6 @@
         "hash": {
             "sha256": "38bf0e79d02feebcaa764c909adb1426b214f386351a92e47352fdd19807b8c5"
         },
-        "host-environment-markers": {
-            "implementation_name": "cpython",
-            "implementation_version": "3.6.2",
-            "os_name": "posix",
-            "platform_machine": "x86_64",
-            "platform_python_implementation": "CPython",
-            "platform_release": "4.9.0-3-amd64",
-            "platform_system": "Linux",
-            "platform_version": "#1 SMP Debian 4.9.30-2+deb9u2 (2017-06-26)",
-            "python_full_version": "3.6.2",
-            "python_version": "3.6",
-            "sys_platform": "linux"
-        },
         "pipfile-spec": 6,
         "requires": {
             "python_version": "3.6"
@@ -31,15 +18,15 @@
     "default": {
         "certifi": {
             "hashes": [
-                "sha256:14131608ad2fd56836d33a71ee60fa1c82bc9d2c8d98b7bdbc631fe1b3cd1296",
-                "sha256:edbc3f203427eef571f79a7692bb160a2b0f7ccaa31953e99bd17e307cf63f7d"
+                "sha256:e4f3620cfea4f83eedc95b24abd9cd56f3c4b146dd0177e83a21b4eb49e21e50",
+                "sha256:fd7c7c74727ddcf00e9acd26bba8da604ffec95bf1c2144e67aff7a8b50e6cef"
             ],
-            "version": "==2018.1.18"
+            "version": "==2019.9.11"
         },
         "chardet": {
             "hashes": [
-                "sha256:fc323ffcaeaed0e0a02bf4d117757b98aed530d9ed4531e3e15460124c106691",
-                "sha256:84ab92ed1c4d4f16916e05906b6b75a6c0fb5db821cc65e70cbd64a3e2a5eaae"
+                "sha256:84ab92ed1c4d4f16916e05906b6b75a6c0fb5db821cc65e70cbd64a3e2a5eaae",
+                "sha256:fc323ffcaeaed0e0a02bf4d117757b98aed530d9ed4531e3e15460124c106691"
             ],
             "version": "==3.0.4"
         },
@@ -48,94 +35,76 @@
                 "sha256:52475f607c92035d4ac8fee284f56213065a4a6b25ed43f7e39df0e576e69e9f",
                 "sha256:d96b804be412a5125a594023ec524a2010a6ffa4d408e5482ab6ff3cb97ec12f"
             ],
+            "index": "pypi",
             "version": "==2.0.1"
         },
         "idna": {
             "hashes": [
-                "sha256:8c7309c718f94b3a625cb648ace320157ad16ff131ae0af362c9f21b80ef6ec4",
-                "sha256:2c6a5de3089009e3da7c5dde64a141dbc8551d5b7f6cf4ed7c2568d0cc520a8f"
+                "sha256:2c6a5de3089009e3da7c5dde64a141dbc8551d5b7f6cf4ed7c2568d0cc520a8f",
+                "sha256:8c7309c718f94b3a625cb648ace320157ad16ff131ae0af362c9f21b80ef6ec4"
             ],
             "version": "==2.6"
         },
         "jedi": {
             "hashes": [
-                "sha256:d795f2c2e659f5ea39a839e5230d70a0b045d0daee7ca2403568d8f348d0ad89",
-                "sha256:d6e799d04d1ade9459ed0f20de47c32f2285438956a677d083d3c98def59fa97"
+                "sha256:d6e799d04d1ade9459ed0f20de47c32f2285438956a677d083d3c98def59fa97",
+                "sha256:d795f2c2e659f5ea39a839e5230d70a0b045d0daee7ca2403568d8f348d0ad89"
             ],
+            "index": "pypi",
             "version": "==0.11.1"
         },
         "parso": {
             "hashes": [
-                "sha256:a7bb86fe0844304869d1c08e8bd0e52be931228483025c422917411ab82d628a",
-                "sha256:5815f3fe254e5665f3c5d6f54f086c2502035cb631a91341591b5a564203cffb"
+                "sha256:5815f3fe254e5665f3c5d6f54f086c2502035cb631a91341591b5a564203cffb",
+                "sha256:a7bb86fe0844304869d1c08e8bd0e52be931228483025c422917411ab82d628a"
             ],
             "version": "==0.1.1"
         },
         "pillow": {
             "hashes": [
-                "sha256:718ec7a122b28d64afc5fbc3a9b99bb0545ef511373cac06fe7624520e82cb20",
-                "sha256:801cca8923508311bf5d6d0f7da5362552e8208ebd8ec0d7b9f2cd2ff5705734",
-                "sha256:43334f9581cd067945b8898cef9eb5714ee4883f8de0304c011f1dbdb1d4e2aa",
-                "sha256:153ec6f18f7b61641e0e6e502acfaf4a06c9aba2ea11c0b4b3578ea9f13a4a4a",
-                "sha256:25193f934d37d836a6b1f4c062ce574a96cbca7c6d9dc8ddfbbac7f9c54deaa4",
-                "sha256:b85f703c2ffe539313e39ce0676bed0f355cec45a16e58c9ab7417445843047c",
-                "sha256:8580fc58074a16b749905b26cf8363f7b628dd167ba0130f5382cdc91c86b509",
-                "sha256:2fcde9954c8882d1c7f93bb828caa34a4c5e3ee69dbc7895dc8652ad972b455a",
-                "sha256:1a5b93084e01328a1cb1ecdad99d11d75e881e89a95f88d85b523646553b36c2",
-                "sha256:b2240f298482f823576f397bb9f32ea913ad9456c526e141bc6f0a022b37a3e8",
-                "sha256:b1d33c63a55d0d85df0ad02b2c16158fb4d8153afa7b908f1a67330fac694cd6",
-                "sha256:6977cf073d83358b34f93abf5c1f1193b88675fe0e4441e0e28318bc3dcba7a0",
-                "sha256:1912b7230459fd53682dae32b83cbd8e5d642ba36d4be18566f00a9c063aa13d",
-                "sha256:4bd4a71501b6d51db4abc07e1f43f5a6fed0a1a9583cca0b401d6af50284b0db",
-                "sha256:0013f590a8f260df60bcfd65db19d18efc04e7f046c3c82a40e2e2b3292a937c",
-                "sha256:a224651a81e45ef4f1d0164e256c5f6b4abb49f2ae8f22ba2f3a9d0ff338e608",
-                "sha256:c793dfaa130847ccff958492b76ae8b9304e60b8a79a92962cb19e368276a22b",
-                "sha256:0b899ee80920bb533f26581af9b4660bc12aff4562555afe74e429101ebf3c94",
-                "sha256:9525cd680a6f9e80c6c0af03cf973e6505c59f60b4745f682cd1a449e54b31bb",
-                "sha256:35f7d998b8e82fb3fb51ff88b30485eb81cd7dd56ec7e1a8deba23eb88532d44",
-                "sha256:5b0d657460d9f3615876fec6306e97ca15a471f6169b622d76a47e270998acf1",
-                "sha256:ddd16ab250b4fc97db1c47407e78c25216a75c29d29d10ad37e51b7a2ec7b2c3",
-                "sha256:b9f63451084a718eccdeb1e382768c94647915653af4d6019f64560d9e98642b",
-                "sha256:a370d1c570f1d72e877099651e752332444b1c5009381f043c9da5fd47f3ebae",
-                "sha256:dc4b018d5c9b636f7546583c5591b9ea00c328c3e5871992ef5b95bac353f097",
-                "sha256:e126ff4fed71e78333840c07279e1617f63cfca76d63ad5b27d65a7277206a3d",
-                "sha256:fcf64c91fd44485100a2965d23bb0e227d093e91f7e776c5ca3b32574766eb56",
-                "sha256:2c042352b430d678db50c78c5214e19638eff8b688941271da2de21fd298dfe5",
-                "sha256:17fe25efc785194d48c38fad85dce470013ba19d2fb66639e149f14bccf1327f",
-                "sha256:2e818dbe445e86fc6c266973fe540c35125c42eb2cf13a6095e9adaa89c0deb5",
-                "sha256:135e9aa65150c53f7db85bf2bebb8a0e1a48ea850e80cf66e16dd04fa09d309c",
-                "sha256:7dfbefdb3fb911ca9faed307bf309861e9995e36cca6b761c7ba6d9b77a9744a",
-                "sha256:12f29d6c23424f704c66b5b68c02fe0b571504459605cfe36ab8158359b0e1bb",
-                "sha256:f8d49be8c282df8d2e1ab6ab53ab8abd859b1fa6fed384457ee85c9eff64ef97",
-                "sha256:82b172e3264e62372c01b5b009b5b1a02fbb9276cbe5cc57ab00a6d6e5ed9a18",
-                "sha256:57aa6198ba8acba1313c3b743e267d821a60cac77e6026caf0b55ca58d3d23be",
-                "sha256:d60c1625b108432ace8b1fa1a584017e5efa73f107d0f493c7f39c79bebf1d41",
-                "sha256:82d1ff571489765df2816785d532e243bde213752156c227fca595723ec5ff42",
-                "sha256:37cc0339abfa9e295c75d9a7f227d35cb44716feb95057f9449c4a9e9a17daf7",
-                "sha256:931030d1d6282b7900e6b0a7ff9ecdb503b5e1e6781800dab2b71a9f39405bff",
-                "sha256:5cd36804f9f06a914a883fe682df5711d16d7b4f44d43189c5f013e7cd91e149"
-            ],
-            "version": "==5.0.0"
+                "sha256:00fdeb23820f30e43bba78eb9abb00b7a937a655de7760b2e09101d63708b64e",
+                "sha256:01f948e8220c85eae1aa1a7f8edddcec193918f933fb07aaebe0bfbbcffefbf1",
+                "sha256:08abf39948d4b5017a137be58f1a52b7101700431f0777bec3d897c3949f74e6",
+                "sha256:099a61618b145ecb50c6f279666bbc398e189b8bc97544ae32b8fcb49ad6b830",
+                "sha256:2c1c61546e73de62747e65807d2cc4980c395d4c5600ecb1f47a650c6fa78c79",
+                "sha256:2ed9c4f694861642401f27dc3cb99772be67cd190e84845c749dae0a06c3bfae",
+                "sha256:338581b30b908e111be578f0297255f6b57a51358cd16fa0e6f664c9a1f88bff",
+                "sha256:38c7d48a21cd06fdeee93987147b9b1c55b73b4cfcbf83240568bfbd5adee447",
+                "sha256:43fd026f613c8e48a25eba1a92f4d2ad7f3903c95d8c33a11611a7717d2ab654",
+                "sha256:4548236844327a718ce3bb182ab32a16fa2050c61e334e959f554cac052fb0df",
+                "sha256:5090857876c58885cfa388dc649e5db30aae98a068c26f3fd0ac9d7d9a4d9572",
+                "sha256:5bbba34f97a26a93f5e8dec469ca4ddd712451418add43da946dbaed7f7a98d2",
+                "sha256:65a28969a025a0eb4594637b6103201dc4ed2a9508bdab56ac33e43e3081c404",
+                "sha256:892bb52b70bd5ea9dbbc3ac44f38e84f5a04e9d8b1bff48159d96cb795b81159",
+                "sha256:8a9becd5cbd5062f973bcd2e7bc79483af310222de112b6541f8af1f93a3cc42",
+                "sha256:972a7aaeb7c4a2795b52eef52ee991ef040b31009f36deca6207a986607b55f3",
+                "sha256:97b119c436bfa96a92ac2ca525f7025836d4d4e64b1c9f9eff8dbaf3ff1d86f3",
+                "sha256:9ba37698e242223f8053cc158f130aee046a96feacbeab65893dbe94f5530118",
+                "sha256:b1b0e1f626a0f079c0d3696db70132fb1f29aa87c66aecb6501a9b8be64ce9f7",
+                "sha256:c14c1224fd1a5be2733530d648a316974dbbb3c946913562c6005a76f21ca042",
+                "sha256:c79a8546c48ae6465189e54e3245a97ddf21161e33ff7eaa42787353417bb2b6",
+                "sha256:ceb76935ac4ebdf6d7bc845482a4450b284c6ccfb281e34da51d510658ab34d8",
+                "sha256:e22bffaad04b4d16e1c091baed7f2733fc1ebb91e0c602abf1b6834d17158b1f",
+                "sha256:ec883b8e44d877bda6f94a36313a1c6063f8b1997aa091628ae2f34c7f97c8d5",
+                "sha256:f1baa54d50ec031d1a9beb89974108f8f2c0706f49798f4777df879df0e1adb6",
+                "sha256:f53a5385932cda1e2c862d89460992911a89768c65d176ff8c50cddca4d29bed"
+            ],
+            "index": "pypi",
+            "version": "==6.2.0"
         },
         "pytz": {
             "hashes": [
-                "sha256:80af0f3008046b9975242012a985f04c5df1f01eed4ec1633d56cc47a75a6a48",
-                "sha256:feb2365914948b8620347784b6b6da356f31c9d03560259070b2f30cff3d469d",
-                "sha256:59707844a9825589878236ff2f4e0dc9958511b7ffaae94dc615da07d4a68d33",
-                "sha256:d0ef5ef55ed3d37854320d4926b04a4cb42a2e88f71da9ddfdacfde8e364f027",
-                "sha256:c41c62827ce9cafacd6f2f7018e4f83a6f1986e87bfd000b8cfbd4ab5da95f1a",
-                "sha256:8cc90340159b5d7ced6f2ba77694d946fc975b09f1a51d93f3ce3bb399396f94",
-                "sha256:dd2e4ca6ce3785c8dd342d1853dd9052b19290d5bf66060846e5dc6b8d6667f7",
-                "sha256:699d18a2a56f19ee5698ab1123bbcc1d269d061996aeb1eda6d89248d3542b82",
-                "sha256:fae4cffc040921b8a2d60c6cf0b5d662c1190fe54d718271db4eb17d44a185b7"
+                "sha256:1c557d7d0e871de1f5ccd5833f60fb2550652da6be2693c1e02300743d21500d",
+                "sha256:b02c06db6cf09c12dd25137e563b31700d3b80fcc4ad23abb7a315f2789819be"
             ],
-            "version": "==2017.3"
+            "version": "==2019.3"
         },
         "requests": {
             "hashes": [
                 "sha256:6a1b267aa90cac58ac3a765d067950e7dbbf75b1da07e895d1f594193a40a38b",
                 "sha256:9c443e7324ba5b85070c4a818ade28bfabedf16ea10206da1132edaa6dda237e"
             ],
+            "index": "pypi",
             "version": "==2.18.4"
         },
         "urllib3": {
@@ -151,26 +120,30 @@
             "hashes": [
                 "sha256:ff787bffb812818c3071784b5ce9a35f8c481a0de7ea0ce4f8b68b8788a12f30"
             ],
+            "index": "pypi",
             "version": "==1.3.3"
         },
         "flake8": {
             "hashes": [
-                "sha256:c7841163e2b576d435799169b78703ad6ac1bbb0f199994fc05f700b2a90ea37",
-                "sha256:7253265f7abd8b313e3892944044a365e3f4ac3fcdcfb4298f55ee9ddf188ba0"
+                "sha256:7253265f7abd8b313e3892944044a365e3f4ac3fcdcfb4298f55ee9ddf188ba0",
+                "sha256:c7841163e2b576d435799169b78703ad6ac1bbb0f199994fc05f700b2a90ea37"
             ],
+            "index": "pypi",
             "version": "==3.5.0"
         },
         "importmagic": {
             "hashes": [
                 "sha256:3f7757a5b74c9a291e20e12023bb3bf71bc2fa3adfb15a08570648ab83eaf8d8"
             ],
+            "index": "pypi",
             "version": "==0.1.7"
         },
         "jedi": {
             "hashes": [
-                "sha256:d795f2c2e659f5ea39a839e5230d70a0b045d0daee7ca2403568d8f348d0ad89",
-                "sha256:d6e799d04d1ade9459ed0f20de47c32f2285438956a677d083d3c98def59fa97"
+                "sha256:d6e799d04d1ade9459ed0f20de47c32f2285438956a677d083d3c98def59fa97",
+                "sha256:d795f2c2e659f5ea39a839e5230d70a0b045d0daee7ca2403568d8f348d0ad89"
             ],
+            "index": "pypi",
             "version": "==0.11.1"
         },
         "mccabe": {
@@ -182,15 +155,15 @@
         },
         "parso": {
             "hashes": [
-                "sha256:a7bb86fe0844304869d1c08e8bd0e52be931228483025c422917411ab82d628a",
-                "sha256:5815f3fe254e5665f3c5d6f54f086c2502035cb631a91341591b5a564203cffb"
+                "sha256:5815f3fe254e5665f3c5d6f54f086c2502035cb631a91341591b5a564203cffb",
+                "sha256:a7bb86fe0844304869d1c08e8bd0e52be931228483025c422917411ab82d628a"
             ],
             "version": "==0.1.1"
         },
         "pycodestyle": {
             "hashes": [
-                "sha256:6c4245ade1edfad79c3446fadfc96b0de2759662dc29d07d80a6f27ad1ca6ba9",
-                "sha256:682256a5b318149ca0d2a9185d365d8864a768a28db66a84a2ea946bcc426766"
+                "sha256:682256a5b318149ca0d2a9185d365d8864a768a28db66a84a2ea946bcc426766",
+                "sha256:6c4245ade1edfad79c3446fadfc96b0de2759662dc29d07d80a6f27ad1ca6ba9"
             ],
             "version": "==2.3.1"
         },
@@ -205,6 +178,7 @@
             "hashes": [
                 "sha256:a09edfd2034fd50099a67822f9bd851fbd0f4e98d3b87519f6267b60e50d80d1"
             ],
+            "index": "pypi",
             "version": "==0.10.7"
         },
         "yapf": {
@@ -212,6 +186,7 @@
                 "sha256:a0bbc8ed274609f9c7575a5d69056fa393e26a778b3e070a72f4998b8e90c3cd",
                 "sha256:bd19f246be7193ad2acdc04702b92315f1ae28d49c82f6671afdeefe9d32f468"
             ],
+            "index": "pypi",
             "version": "==0.20.1"
         }
     }