chore(package): update babel-loader to version 8.0.4

Closes #3019

package.json

@@ -33,7 +33,7 @@
     "autoprefixer": "^9.0.1",
     "babel-core": "^6.23.1",
     "babel-eslint": "^10.0.1",
-    "babel-loader": "^7.1.0",
+    "babel-loader": "^8.0.4",
     "babel-plugin-syntax-dynamic-import": "^6.18.0",
     "babel-plugin-transform-async-to-generator": "^6.24.1",
     "babel-plugin-transform-object-rest-spread": "^6.22.0",