fix(package): update copy-webpack-plugin to version 5.0.4

Closes #245

Author: greenkeeper[bot]

package.json

@@ -43,7 +43,7 @@
     "bcryptjs": "^2.4.3",
     "body-parser": "^1.18.2",
     "clean-webpack-plugin": "^0.1.19",
-    "copy-webpack-plugin": "^4.5.1",
+    "copy-webpack-plugin": "^5.0.4",
     "css-loader": "^0.28.7",
     "express": "^4.16.1",
     "express-jwt": "^5.3.0",