diff --git a/package.json b/package.json
index 2725ba6..27def4a 100644
--- a/package.json
+++ b/package.json
@@ -85,7 +85,7 @@
     "webpack-dev-server": "3.2.1",
     "webpack-merge": "4.2.1",
     "which": "1.3.1",
-    "workbox-webpack-plugin": "3.6.3",
+    "workbox-webpack-plugin": "4.0.0",
     "yargs": "13.2.1"
   },
   "devDependencies": {
diff --git a/yarn.lock b/yarn.lock
index e71574c..f3108da 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -650,6 +650,13 @@
     pirates "^4.0.0"
     source-map-support "^0.5.9"
 
+"@babel/runtime@^7.0.0":
+  version "7.3.4"
+  resolved "https://registry.yarnpkg.com/@babel/runtime/-/runtime-7.3.4.tgz#73d12ba819e365fcf7fd152aed56d6df97d21c83"
+  integrity sha512-IvfvnMdSaLBateu0jfsYIpZTxAc2cKEXEMiezGGN75QcBcecDUKd3PgLAncT0oOgxKy8dd8hrJKj9MfzgfZd6g==
+  dependencies:
+    regenerator-runtime "^0.12.0"
+
 "@babel/template@^7.0.0", "@babel/template@^7.1.0", "@babel/template@^7.1.2", "@babel/template@^7.2.2":
   version "7.2.2"
   resolved "https://registry.yarnpkg.com/@babel/template/-/template-7.2.2.tgz#005b3fdf0ed96e88041330379e0da9a708eb2907"
@@ -6848,6 +6855,11 @@ regenerator-runtime@^0.11.0:
   resolved "https://registry.yarnpkg.com/regenerator-runtime/-/regenerator-runtime-0.11.1.tgz#be05ad7f9bf7d22e056f9726cee5017fbf19e2e9"
   integrity sha512-MguG95oij0fC3QV3URf4V2SDYGJhJnJGqvIIgdECeODCT98wSWDAJ94SSuVpYQUoTcGUIL6L4yNB7j1DFFHSBg==
 
+regenerator-runtime@^0.12.0:
+  version "0.12.1"
+  resolved "https://registry.yarnpkg.com/regenerator-runtime/-/regenerator-runtime-0.12.1.tgz#fa1a71544764c036f8c49b13a08b2594c9f8a0de"
+  integrity sha512-odxIc1/vDlo4iZcfXqRYFj0vpXFNoGdKMAUieAlFYO6m/nl5e9KR/beGf41z4a1FI+aQgtjhuaSlDxQ0hmkrHg==
+
 regenerator-transform@^0.13.3:
   version "0.13.3"
   resolved "https://registry.yarnpkg.com/regenerator-transform/-/regenerator-transform-0.13.3.tgz#264bd9ff38a8ce24b06e0636496b2c856b57bcbb"
@@ -8417,26 +8429,26 @@ wordwrap@~1.0.0:
   resolved "https://registry.yarnpkg.com/wordwrap/-/wordwrap-1.0.0.tgz#27584810891456a4171c8d0226441ade90cbcaeb"
   integrity sha1-J1hIEIkUVqQXHI0CJkQa3pDLyus=
 
-workbox-background-sync@^3.6.3:
-  version "3.6.3"
-  resolved "https://registry.yarnpkg.com/workbox-background-sync/-/workbox-background-sync-3.6.3.tgz#6609a0fac9eda336a7c52e6aa227ba2ae532ad94"
-  integrity sha512-ypLo0B6dces4gSpaslmDg5wuoUWrHHVJfFWwl1udvSylLdXvnrfhFfriCS42SNEe5lsZtcNZF27W/SMzBlva7Q==
+workbox-background-sync@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/workbox-background-sync/-/workbox-background-sync-4.0.0.tgz#231988ea3813a06825e887860b2e702e1db824e7"
+  integrity sha512-U8hCVqF1m/xaQnRVI4N3eRK9sQwlEH6C5BGORwVs4jBTf1bfo3EDUR2K1qhkWdGgRKBWQfSb2YHVBrxlpt6z8g==
   dependencies:
-    workbox-core "^3.6.3"
+    workbox-core "^4.0.0"
 
-workbox-broadcast-cache-update@^3.6.3:
-  version "3.6.3"
-  resolved "https://registry.yarnpkg.com/workbox-broadcast-cache-update/-/workbox-broadcast-cache-update-3.6.3.tgz#3f5dff22ada8c93e397fb38c1dc100606a7b92da"
-  integrity sha512-pJl4lbClQcvp0SyTiEw0zLSsVYE1RDlCPtpKnpMjxFtu8lCFTAEuVyzxp9w7GF4/b3P4h5nyQ+q7V9mIR7YzGg==
+workbox-broadcast-update@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/workbox-broadcast-update/-/workbox-broadcast-update-4.0.0.tgz#2ff32dcdbba16a5bf44d1312527363e19b7749d1"
+  integrity sha512-xnnhXdgKU5OLFzc4v6n12O0iX+I4IxEZ2zV9xEQiUXCRWh/8gEcyXFdPK7Tayj5C3NwN1wrQgpSCJ5FBwVr63Q==
   dependencies:
-    workbox-core "^3.6.3"
+    workbox-core "^4.0.0"
 
-workbox-build@^3.6.3:
-  version "3.6.3"
-  resolved "https://registry.yarnpkg.com/workbox-build/-/workbox-build-3.6.3.tgz#77110f9f52dc5d82fa6c1c384c6f5e2225adcbd8"
-  integrity sha512-w0clZ/pVjL8VXy6GfthefxpEXs0T8uiRuopZSFVQ8ovfbH6c6kUpEh6DcYwm/Y6dyWPiCucdyAZotgjz+nRz8g==
+workbox-build@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/workbox-build/-/workbox-build-4.0.0.tgz#60747daf8831f82c0e3da6124dda854971049637"
+  integrity sha512-xWz4I1ZGVWQpgBq+Q8xsFF0fdHkVM+8N+uoPm+XCujmYlhxry+f87c49Yp/DcV1mHr6YIqcA5lnZu0ix77iacg==
   dependencies:
-    babel-runtime "^6.26.0"
+    "@babel/runtime" "^7.0.0"
     common-tags "^1.4.0"
     fs-extra "^4.0.2"
     glob "^7.1.2"
@@ -8445,104 +8457,112 @@ workbox-build@^3.6.3:
     pretty-bytes "^4.0.2"
     stringify-object "^3.2.2"
     strip-comments "^1.0.2"
-    workbox-background-sync "^3.6.3"
-    workbox-broadcast-cache-update "^3.6.3"
-    workbox-cache-expiration "^3.6.3"
-    workbox-cacheable-response "^3.6.3"
-    workbox-core "^3.6.3"
-    workbox-google-analytics "^3.6.3"
-    workbox-navigation-preload "^3.6.3"
-    workbox-precaching "^3.6.3"
-    workbox-range-requests "^3.6.3"
-    workbox-routing "^3.6.3"
-    workbox-strategies "^3.6.3"
-    workbox-streams "^3.6.3"
-    workbox-sw "^3.6.3"
-
-workbox-cache-expiration@^3.6.3:
-  version "3.6.3"
-  resolved "https://registry.yarnpkg.com/workbox-cache-expiration/-/workbox-cache-expiration-3.6.3.tgz#4819697254a72098a13f94b594325a28a1e90372"
-  integrity sha512-+ECNph/6doYx89oopO/UolYdDmQtGUgo8KCgluwBF/RieyA1ZOFKfrSiNjztxOrGJoyBB7raTIOlEEwZ1LaHoA==
-  dependencies:
-    workbox-core "^3.6.3"
-
-workbox-cacheable-response@^3.6.3:
-  version "3.6.3"
-  resolved "https://registry.yarnpkg.com/workbox-cacheable-response/-/workbox-cacheable-response-3.6.3.tgz#869f1a68fce9063f6869ddbf7fa0a2e0a868b3aa"
-  integrity sha512-QpmbGA9SLcA7fklBLm06C4zFg577Dt8u3QgLM0eMnnbaVv3rhm4vbmDpBkyTqvgK/Ly8MBDQzlXDtUCswQwqqg==
-  dependencies:
-    workbox-core "^3.6.3"
-
-workbox-core@^3.6.3:
-  version "3.6.3"
-  resolved "https://registry.yarnpkg.com/workbox-core/-/workbox-core-3.6.3.tgz#69abba70a4f3f2a5c059295a6f3b7c62bd00e15c"
-  integrity sha512-cx9cx0nscPkIWs8Pt98HGrS9/aORuUcSkWjG25GqNWdvD/pSe7/5Oh3BKs0fC+rUshCiyLbxW54q0hA+GqZeSQ==
-
-workbox-google-analytics@^3.6.3:
-  version "3.6.3"
-  resolved "https://registry.yarnpkg.com/workbox-google-analytics/-/workbox-google-analytics-3.6.3.tgz#99df2a3d70d6e91961e18a6752bac12e91fbf727"
-  integrity sha512-RQBUo/6SXtIaQTRFj4RQZ9e1gAl7D8oS5S+Hi173Kk70/BgJjzPwXpC5A249Jv5YfkCOLMQCeF9A27BiD0b0ig==
-  dependencies:
-    workbox-background-sync "^3.6.3"
-    workbox-core "^3.6.3"
-    workbox-routing "^3.6.3"
-    workbox-strategies "^3.6.3"
-
-workbox-navigation-preload@^3.6.3:
-  version "3.6.3"
-  resolved "https://registry.yarnpkg.com/workbox-navigation-preload/-/workbox-navigation-preload-3.6.3.tgz#a2c34eb7c17e7485b795125091215f757b3c4964"
-  integrity sha512-dd26xTX16DUu0i+MhqZK/jQXgfIitu0yATM4jhRXEmpMqQ4MxEeNvl2CgjDMOHBnCVMax+CFZQWwxMx/X/PqCw==
-  dependencies:
-    workbox-core "^3.6.3"
-
-workbox-precaching@^3.6.3:
-  version "3.6.3"
-  resolved "https://registry.yarnpkg.com/workbox-precaching/-/workbox-precaching-3.6.3.tgz#5341515e9d5872c58ede026a31e19bafafa4e1c1"
-  integrity sha512-aBqT66BuMFviPTW6IpccZZHzpA8xzvZU2OM1AdhmSlYDXOJyb1+Z6blVD7z2Q8VNtV1UVwQIdImIX+hH3C3PIw==
-  dependencies:
-    workbox-core "^3.6.3"
-
-workbox-range-requests@^3.6.3:
-  version "3.6.3"
-  resolved "https://registry.yarnpkg.com/workbox-range-requests/-/workbox-range-requests-3.6.3.tgz#3cc21cba31f2dd8c43c52a196bcc8f6cdbcde803"
-  integrity sha512-R+yLWQy7D9aRF9yJ3QzwYnGFnGDhMUij4jVBUVtkl67oaVoP1ymZ81AfCmfZro2kpPRI+vmNMfxxW531cqdx8A==
-  dependencies:
-    workbox-core "^3.6.3"
-
-workbox-routing@^3.6.3:
-  version "3.6.3"
-  resolved "https://registry.yarnpkg.com/workbox-routing/-/workbox-routing-3.6.3.tgz#659cd8f9274986cfa98fda0d050de6422075acf7"
-  integrity sha512-bX20i95OKXXQovXhFOViOK63HYmXvsIwZXKWbSpVeKToxMrp0G/6LZXnhg82ijj/S5yhKNRf9LeGDzaqxzAwMQ==
-  dependencies:
-    workbox-core "^3.6.3"
-
-workbox-strategies@^3.6.3:
-  version "3.6.3"
-  resolved "https://registry.yarnpkg.com/workbox-strategies/-/workbox-strategies-3.6.3.tgz#11a0dc249a7bc23d3465ec1322d28fa6643d64a0"
-  integrity sha512-Pg5eulqeKet2y8j73Yw6xTgLdElktcWExGkzDVCGqfV9JCvnGuEpz5eVsCIK70+k4oJcBCin9qEg3g3CwEIH3g==
-  dependencies:
-    workbox-core "^3.6.3"
-
-workbox-streams@^3.6.3:
-  version "3.6.3"
-  resolved "https://registry.yarnpkg.com/workbox-streams/-/workbox-streams-3.6.3.tgz#beaea5d5b230239836cc327b07d471aa6101955a"
-  integrity sha512-rqDuS4duj+3aZUYI1LsrD2t9hHOjwPqnUIfrXSOxSVjVn83W2MisDF2Bj+dFUZv4GalL9xqErcFW++9gH+Z27w==
-  dependencies:
-    workbox-core "^3.6.3"
-
-workbox-sw@^3.6.3:
-  version "3.6.3"
-  resolved "https://registry.yarnpkg.com/workbox-sw/-/workbox-sw-3.6.3.tgz#278ea4c1831b92bbe2d420da8399176c4b2789ff"
-  integrity sha512-IQOUi+RLhvYCiv80RP23KBW/NTtIvzvjex28B8NW1jOm+iV4VIu3VXKXTA6er5/wjjuhmtB28qEAUqADLAyOSg==
-
-workbox-webpack-plugin@3.6.3:
-  version "3.6.3"
-  resolved "https://registry.yarnpkg.com/workbox-webpack-plugin/-/workbox-webpack-plugin-3.6.3.tgz#a807bb891b4e4e3c808df07e58f17de2d5ba6182"
-  integrity sha512-RwmKjc7HFHUFHoOlKoZUq9349u0QN3F8W5tZZU0vc1qsBZDINWXRiIBCAKvo/Njgay5sWz7z4I2adnyTo97qIQ==
+    workbox-background-sync "^4.0.0"
+    workbox-broadcast-update "^4.0.0"
+    workbox-cacheable-response "^4.0.0"
+    workbox-core "^4.0.0"
+    workbox-expiration "^4.0.0"
+    workbox-google-analytics "^4.0.0"
+    workbox-navigation-preload "^4.0.0"
+    workbox-precaching "^4.0.0"
+    workbox-range-requests "^4.0.0"
+    workbox-routing "^4.0.0"
+    workbox-strategies "^4.0.0"
+    workbox-streams "^4.0.0"
+    workbox-sw "^4.0.0"
+    workbox-window "^4.0.0"
+
+workbox-cacheable-response@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/workbox-cacheable-response/-/workbox-cacheable-response-4.0.0.tgz#3ac3e5a01d29a0005cf6ff9560cfe0502c8358a8"
+  integrity sha512-cT3b1iotdV5+rYZKnAWvo3D8UAgfuN2HWuf+WuNC1YR0tnGmFAOX8shfEV9DZmnzxDgY8cOcOCK8PSf5uCaGBg==
   dependencies:
-    babel-runtime "^6.26.0"
+    workbox-core "^4.0.0"
+
+workbox-core@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/workbox-core/-/workbox-core-4.0.0.tgz#3b4aa11c9d739361ed8916b7611abc3b6fefed8b"
+  integrity sha512-FRoOUuJBl7COTwvGO5FC9k0VyYGv/LkjVqgVwKk9MXQn/Xi+bvGDcqSVF7qfT+sJ6Ffcr/V+dVMpoZAE/X5e+g==
+
+workbox-expiration@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/workbox-expiration/-/workbox-expiration-4.0.0.tgz#098f804df178b6212e1e208be072e6f54026eec0"
+  integrity sha512-j0h8H8hmSd+Sh9qSlmC1JwViRdxtzbdjuH32qmkYgXDGXwMprV6QU2kQ51J+7Dhm10OdQ64RGfGjbe7bjgzDuw==
+  dependencies:
+    workbox-core "^4.0.0"
+
+workbox-google-analytics@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/workbox-google-analytics/-/workbox-google-analytics-4.0.0.tgz#51c98cc471e5b35c7f86b3aff1d74a28036707e2"
+  integrity sha512-WjZM3frkuCYQUmq8uICzpt+3NnjKhO/GEV+EOqRJgZMfZfmFxMUHbUKi3I/8TXWLigWJbtv/mh4zh0OtFX+vKw==
+  dependencies:
+    workbox-background-sync "^4.0.0"
+    workbox-core "^4.0.0"
+    workbox-routing "^4.0.0"
+    workbox-strategies "^4.0.0"
+
+workbox-navigation-preload@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/workbox-navigation-preload/-/workbox-navigation-preload-4.0.0.tgz#96255fb2f060f0b1306755cce87ca27202e830ba"
+  integrity sha512-G2sDCrekZUNFxkBSAcYQHkUbVMJwhkdVFqnCYxmeTiBzOILokVsghmr90CQ4m98gcqc+P4GoMMc+196jN9r+SA==
+  dependencies:
+    workbox-core "^4.0.0"
+
+workbox-precaching@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/workbox-precaching/-/workbox-precaching-4.0.0.tgz#941624d0135d9df3d88929a9de7e20bda0e8d771"
+  integrity sha512-juI7N+Rj2/CWU3FXedcDLdjzqvRMpkaQsdsfAxBii5017bivw3Dve/kf4qXePccD2hJ973vKY2F7EJRUos8JvA==
+  dependencies:
+    workbox-core "^4.0.0"
+
+workbox-range-requests@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/workbox-range-requests/-/workbox-range-requests-4.0.0.tgz#9fffba4a7a070c747ed766cbf3063978a855e749"
+  integrity sha512-zymg51V1kZAXrzRNNS+da9nnDKdrOfkV/hoYYr0H174c5gIuT3mcwJFr27AhdTrP7wdEMtWFwlOFMyv99lQxTQ==
+  dependencies:
+    workbox-core "^4.0.0"
+
+workbox-routing@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/workbox-routing/-/workbox-routing-4.0.0.tgz#96c078287494b9d279afd44739da97d3d4d782cb"
+  integrity sha512-NCo/S4E/MGi0LPC54pAQEKncWbV7Px5NtB4pWpq1RES2nLisS9SwA/7RnaESk9XpCFt4K788soQOKGzbTcQFdQ==
+  dependencies:
+    workbox-core "^4.0.0"
+
+workbox-strategies@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/workbox-strategies/-/workbox-strategies-4.0.0.tgz#4837dece455dfbb64830c3adbdc93816d22c9ca0"
+  integrity sha512-837Mk734rhNaqsD1uwWuDjoDddnkfaHWQMyCmBwUzsFb4UnRdInLH9SNIXDm6LgkDjKcoEdKAbp6336De60wLg==
+  dependencies:
+    workbox-core "^4.0.0"
+
+workbox-streams@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/workbox-streams/-/workbox-streams-4.0.0.tgz#64c92874a2a27fc37230a15c220f7c61ea04775a"
+  integrity sha512-q9HE8r3BoLBZFAj5FWOhVnjcfmQ+lMaUxZS4FK259xeYDTF9wfo8cxN+inJyCeX6nq6jbWo7XWqGlXV88vaFfg==
+  dependencies:
+    workbox-core "^4.0.0"
+
+workbox-sw@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/workbox-sw/-/workbox-sw-4.0.0.tgz#7cd07470ee79d4caaf829c2ee97c29651d508027"
+  integrity sha512-lVSNtzOPbycn8pSuNtfroT+lXNBry8sUL1494cURIZE1MMFcxCZRv/718LoKIBeJnRYBKa/sXO2GXLzssHX15w==
+
+workbox-webpack-plugin@4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/workbox-webpack-plugin/-/workbox-webpack-plugin-4.0.0.tgz#8c976e7569392ac810c5115d5131ba029b311caf"
+  integrity sha512-J1FGWnOcLySCcV9V0t8bIQKTxrQy4OoIT9aBMjnapwPPFJqFcCmxhnU3ozhJDhZh5nrFzE9gbO16yyMs3DQC6g==
+  dependencies:
+    "@babel/runtime" "^7.0.0"
     json-stable-stringify "^1.0.1"
-    workbox-build "^3.6.3"
+    workbox-build "^4.0.0"
+
+workbox-window@^4.0.0:
+  version "4.0.0"
+  resolved "https://registry.yarnpkg.com/workbox-window/-/workbox-window-4.0.0.tgz#a4d6404c96cc65d4882f79331d4e812c10f912a6"
+  integrity sha512-gdLzP/L0vu5Gi3pdUYtVNmg0yE7OriEuYZBoLt8AYoILXh6cta9WsWHKQ0/pXfmEmZywr4Dfu0qkLLvc9VlZGQ==
+  dependencies:
+    workbox-core "^4.0.0"
 
 worker-farm@^1.5.2:
   version "1.6.0"