Update dependency webpack to v4.40.2

package.json

@@ -65,7 +65,7 @@
     "sw-precache-webpack-plugin": "0.11.5",
     "uglifyjs-webpack-plugin": "2.2.0",
     "url-loader": "2.1.0",
-    "webpack": "4.39.3",
+    "webpack": "4.40.2",
     "webpack-manifest-plugin": "2.0.4",
     "webpack-merge": "4.2.2"
   },

yarn.lock

@@ -11702,10 +11702,10 @@ webpack-sources@^1.4.0, webpack-sources@^1.4.1:
     source-list-map "^2.0.0"
     source-map "~0.6.1"
 
-webpack@4.39.3:
-  version "4.39.3"
-  resolved "https://registry.yarnpkg.com/webpack/-/webpack-4.39.3.tgz#a02179d1032156b713b6ec2da7e0df9d037def50"
-  integrity sha512-BXSI9M211JyCVc3JxHWDpze85CvjC842EvpRsVTc/d15YJGlox7GIDd38kJgWrb3ZluyvIjgenbLDMBQPDcxYQ==
+webpack@4.40.2:
+  version "4.40.2"
+  resolved "https://registry.yarnpkg.com/webpack/-/webpack-4.40.2.tgz#d21433d250f900bf0facbabe8f50d585b2dc30a7"
+  integrity sha512-5nIvteTDCUws2DVvP9Qe+JPla7kWPPIDFZv55To7IycHWZ+Z5qBdaBYPyuXWdhggTufZkQwfIK+5rKQTVovm2A==
   dependencies:
     "@webassemblyjs/ast" "1.8.5"
     "@webassemblyjs/helper-module-context" "1.8.5"