diff --git a/Chapter07/gamestore/Pipfile.lock b/Chapter07/gamestore/Pipfile.lock
index daf8ee9..52d7422 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"
+                "sha256:2bbf76fd432960138b3ef6dda3dde0544f27cbf8546c458e60baf371917ba9ee",
+                "sha256:50b1e4f8446b06f41be7dd6338db18e0990601dce795c2b1686458aa7e8fa7d8"
             ],
-            "version": "==2018.1.18"
+            "version": "==2021.5.30"
         },
         "chardet": {
             "hashes": [
-                "sha256:fc323ffcaeaed0e0a02bf4d117757b98aed530d9ed4531e3e15460124c106691",
-                "sha256:84ab92ed1c4d4f16916e05906b6b75a6c0fb5db821cc65e70cbd64a3e2a5eaae"
+                "sha256:84ab92ed1c4d4f16916e05906b6b75a6c0fb5db821cc65e70cbd64a3e2a5eaae",
+                "sha256:fc323ffcaeaed0e0a02bf4d117757b98aed530d9ed4531e3e15460124c106691"
             ],
             "version": "==3.0.4"
         },
@@ -48,94 +35,103 @@
                 "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"
+                "sha256:0412516dcc9de9b0a1e0ae25a280015809de8270f134cc2c1e32c4eeb397cf30",
+                "sha256:04835e68ef12904bc3e1fd002b33eea0779320d4346082bd5b24bec12ad9c3e9",
+                "sha256:06d1adaa284696785375fa80a6a8eb309be722cf4ef8949518beb34487a3df71",
+                "sha256:085a90a99404b859a4b6c3daa42afde17cb3ad3115e44a75f0d7b4a32f06a6c9",
+                "sha256:0b9911ec70731711c3b6ebcde26caea620cbdd9dcb73c67b0730c8817f24711b",
+                "sha256:10e00f7336780ca7d3653cf3ac26f068fa11b5a96894ea29a64d3dc4b810d630",
+                "sha256:11c27e74bab423eb3c9232d97553111cc0be81b74b47165f07ebfdd29d825875",
+                "sha256:11eb7f98165d56042545c9e6db3ce394ed8b45089a67124298f0473b29cb60b2",
+                "sha256:13654b521fb98abdecec105ea3fb5ba863d1548c9b58831dd5105bb3873569f1",
+                "sha256:15ccb81a6ffc57ea0137f9f3ac2737ffa1d11f786244d719639df17476d399a7",
+                "sha256:18a07a683805d32826c09acfce44a90bf474e6a66ce482b1c7fcd3757d588df3",
+                "sha256:19ec4cfe4b961edc249b0e04b5618666c23a83bc35842dea2bfd5dfa0157f81b",
+                "sha256:1c3ff00110835bdda2b1e2b07f4a2548a39744bb7de5946dc8e95517c4fb2ca6",
+                "sha256:27a330bf7014ee034046db43ccbb05c766aa9e70b8d6c5260bfc38d73103b0ba",
+                "sha256:2b11c9d310a3522b0fd3c35667914271f570576a0e387701f370eb39d45f08a4",
+                "sha256:2c661542c6f71dfd9dc82d9d29a8386287e82813b0375b3a02983feac69ef864",
+                "sha256:2cde7a4d3687f21cffdf5bb171172070bb95e02af448c4c8b2f223d783214056",
+                "sha256:2d5e9dc0bf1b5d9048a94c48d0813b6c96fccfa4ccf276d9c36308840f40c228",
+                "sha256:2f23b2d3079522fdf3c09de6517f625f7a964f916c956527bed805ac043799b8",
+                "sha256:35d27687f027ad25a8d0ef45dd5208ef044c588003cdcedf05afb00dbc5c2deb",
+                "sha256:35d409030bf3bd05fa66fb5fdedc39c521b397f61ad04309c90444e893d05f7d",
+                "sha256:4326ea1e2722f3dc00ed77c36d3b5354b8fb7399fb59230249ea6d59cbed90da",
+                "sha256:4abc247b31a98f29e5224f2d31ef15f86a71f79c7f4d2ac345a5d551d6393073",
+                "sha256:4d89a2e9219a526401015153c0e9dd48319ea6ab9fe3b066a20aa9aee23d9fd3",
+                "sha256:4e59e99fd680e2b8b11bbd463f3c9450ab799305d5f2bafb74fefba6ac058616",
+                "sha256:548794f99ff52a73a156771a0402f5e1c35285bd981046a502d7e4793e8facaa",
+                "sha256:56fd98c8294f57636084f4b076b75f86c57b2a63a8410c0cd172bc93695ee979",
+                "sha256:59697568a0455764a094585b2551fd76bfd6b959c9f92d4bdec9d0e14616303a",
+                "sha256:6bff50ba9891be0a004ef48828e012babaaf7da204d81ab9be37480b9020a82b",
+                "sha256:6cb3dd7f23b044b0737317f892d399f9e2f0b3a02b22b2c692851fb8120d82c6",
+                "sha256:7dbfbc0020aa1d9bc1b0b8bcf255a7d73f4ad0336f8fd2533fcc54a4ccfb9441",
+                "sha256:838eb85de6d9307c19c655c726f8d13b8b646f144ca6b3771fa62b711ebf7624",
+                "sha256:8b68f565a4175e12e68ca900af8910e8fe48aaa48fd3ca853494f384e11c8bcd",
+                "sha256:8f284dc1695caf71a74f24993b7c7473d77bc760be45f776a2c2f4e04c170550",
+                "sha256:963ebdc5365d748185fdb06daf2ac758116deecb2277ec5ae98139f93844bc09",
+                "sha256:a048dad5ed6ad1fad338c02c609b862dfaa921fcd065d747194a6805f91f2196",
+                "sha256:a1bd983c565f92779be456ece2479840ec39d386007cd4ae83382646293d681b",
+                "sha256:a66566f8a22561fc1a88dc87606c69b84fa9ce724f99522cf922c801ec68f5c1",
+                "sha256:bcb04ff12e79b28be6c9988f275e7ab69f01cc2ba319fb3114f87817bb7c74b6",
+                "sha256:bd24054aaf21e70a51e2a2a5ed1183560d3a69e6f9594a4bfe360a46f94eba83",
+                "sha256:be25cb93442c6d2f8702c599b51184bd3ccd83adebd08886b682173e09ef0c3f",
+                "sha256:c691b26283c3a31594683217d746f1dad59a7ae1d4cfc24626d7a064a11197d4",
+                "sha256:cc9d0dec711c914ed500f1d0d3822868760954dce98dfb0b7382a854aee55d19",
+                "sha256:ce2e5e04bb86da6187f96d7bab3f93a7877830981b37f0287dd6479e27a10341",
+                "sha256:ce651ca46d0202c302a535d3047c55a0131a720cf554a578fc1b8a2aff0e7d96",
+                "sha256:d0c8ebbfd439c37624db98f3877d9ed12c137cadd99dde2d2eae0dab0bbfc355",
+                "sha256:d675a876b295afa114ca8bf42d7f86b5fb1298e1b6bb9a24405a3f6c8338811c",
+                "sha256:dde3f3ed8d00c72631bc19cbfff8ad3b6215062a5eed402381ad365f82f0c18c",
+                "sha256:e5a31c07cea5edbaeb4bdba6f2b87db7d3dc0f446f379d907e51cc70ea375629",
+                "sha256:f514c2717012859ccb349c97862568fdc0479aad85b0270d6b5a6509dbc142e2",
+                "sha256:fc0db32f7223b094964e71729c0361f93db43664dd1ec86d3df217853cedda87",
+                "sha256:fd4fd83aa912d7b89b4b4a1580d30e2a4242f3936882a3f433586e5ab97ed0d5",
+                "sha256:feb5db446e96bfecfec078b943cc07744cc759893cef045aa8b8b6d6aaa8274e"
+            ],
+            "index": "pypi",
+            "version": "==8.3.2"
         },
         "pytz": {
             "hashes": [
-                "sha256:80af0f3008046b9975242012a985f04c5df1f01eed4ec1633d56cc47a75a6a48",
-                "sha256:feb2365914948b8620347784b6b6da356f31c9d03560259070b2f30cff3d469d",
-                "sha256:59707844a9825589878236ff2f4e0dc9958511b7ffaae94dc615da07d4a68d33",
-                "sha256:d0ef5ef55ed3d37854320d4926b04a4cb42a2e88f71da9ddfdacfde8e364f027",
-                "sha256:c41c62827ce9cafacd6f2f7018e4f83a6f1986e87bfd000b8cfbd4ab5da95f1a",
-                "sha256:8cc90340159b5d7ced6f2ba77694d946fc975b09f1a51d93f3ce3bb399396f94",
-                "sha256:dd2e4ca6ce3785c8dd342d1853dd9052b19290d5bf66060846e5dc6b8d6667f7",
-                "sha256:699d18a2a56f19ee5698ab1123bbcc1d269d061996aeb1eda6d89248d3542b82",
-                "sha256:fae4cffc040921b8a2d60c6cf0b5d662c1190fe54d718271db4eb17d44a185b7"
+                "sha256:83a4a90894bf38e243cf052c8b58f381bfe9a7a483f6a9cab140bc7f702ac4da",
+                "sha256:eb10ce3e7736052ed3623d49975ce333bcd712c7bb19a58b9e2089d4057d0798"
             ],
-            "version": "==2017.3"
+            "version": "==2021.1"
         },
         "requests": {
             "hashes": [
                 "sha256:6a1b267aa90cac58ac3a765d067950e7dbbf75b1da07e895d1f594193a40a38b",
                 "sha256:9c443e7324ba5b85070c4a818ade28bfabedf16ea10206da1132edaa6dda237e"
             ],
+            "index": "pypi",
             "version": "==2.18.4"
         },
         "urllib3": {
@@ -151,26 +147,30 @@
             "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 +182,15 @@
         },
         "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 +205,7 @@
             "hashes": [
                 "sha256:a09edfd2034fd50099a67822f9bd851fbd0f4e98d3b87519f6267b60e50d80d1"
             ],
+            "index": "pypi",
             "version": "==0.10.7"
         },
         "yapf": {
@@ -212,6 +213,7 @@
                 "sha256:a0bbc8ed274609f9c7575a5d69056fa393e26a778b3e070a72f4998b8e90c3cd",
                 "sha256:bd19f246be7193ad2acdc04702b92315f1ae28d49c82f6671afdeefe9d32f468"
             ],
+            "index": "pypi",
             "version": "==0.20.1"
         }
     }