chore(package): update copy-webpack-plugin to version 5.0.2

Closes #81

Author: greenkeeper[bot]

package.json

@@ -63,7 +63,7 @@
     "babel-runtime": "^6.22.0",
     "bore": "^2.0.1",
     "chai": "^4.0.2",
-    "copy-webpack-plugin": "^4.0.1",
+    "copy-webpack-plugin": "^5.0.2",
     "coveralls": "^2.12.0",
     "cross-env": "^5.0.0",
     "css-loader": "^0.28.0",