Bump copy-webpack-plugin from 4.4.1 to 4.4.2 in /www (#859)

Bumps [copy-webpack-plugin](https://github.com/webpack-contrib/copy-webpack-plugin) from 4.4.1 to 4.4.2.
- [Release notes](https://github.com/webpack-contrib/copy-webpack-plugin/releases/tag/v4.4.2)
- [Changelog](https://github.com/webpack-contrib/copy-webpack-plugin/blob/master/CHANGELOG.md)
- [Commits](webpack-contrib/copy-webpack-plugin@v4.4.1...v4.4.2)

www/package.json

@@ -40,7 +40,7 @@
     "chalk": "^2.3.1",
     "cheerio": "^1.0.0-rc.2",
     "clean-webpack-plugin": "^0.1.18",
-    "copy-webpack-plugin": "^4.4.1",
+    "copy-webpack-plugin": "^4.4.2",
     "coveralls": "^3.0.0",
     "cross-env": "^5.1.3",
     "css-loader": "^0.28.10",

www/yarn.lock

@@ -2042,9 +2042,9 @@ copy-descriptor@^0.1.0:
   version "0.1.1"
   resolved "https://registry.yarnpkg.com/copy-descriptor/-/copy-descriptor-0.1.1.tgz#676f6eb3c39997c2ee1ac3a924fd6124748f578d"
 
-copy-webpack-plugin@^4.4.1:
-  version "4.4.1"
-  resolved "https://registry.yarnpkg.com/copy-webpack-plugin/-/copy-webpack-plugin-4.4.1.tgz#1e8c366211db6dc2ddee40e5a3e4fc661dd149e8"
+copy-webpack-plugin@^4.4.2:
+  version "4.4.2"
+  resolved "https://registry.yarnpkg.com/copy-webpack-plugin/-/copy-webpack-plugin-4.4.2.tgz#c92bcd7df4d5e42c51398cc36b23820d0d10446a"
   dependencies:
     cacache "^10.0.1"
     find-cache-dir "^1.0.0"