chore(package): update concurrently to version 5.0.2

Closes #364

Author: greenkeeper[bot]

package.json

@@ -57,7 +57,7 @@
     "babel-eslint": "10.0.1",
     "babel-loader": "8.0.6",
     "clean-webpack-plugin": "^2.0.2",
-    "concurrently": "^4.1.1",
+    "concurrently": "^5.0.2",
     "copy-webpack-plugin": "5.0.3",
     "cross-env": "^5.2.0",
     "css-loader": "3.0.0",