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

Closes #121

Author: greenkeeper[bot]

package.json

@@ -34,7 +34,7 @@
     "babel-cli": "^6.24.1",
     "babel-core": "^6.18.2",
     "babel-eslint": "^8.0.0",
-    "babel-loader": "^7.0.0",
+    "babel-loader": "^8.0.4",
     "babel-plugin-transform-object-rest-spread": "^6.6.5",
     "babel-preset-es2015": "^6.6.0",
     "bluebird": "^3.3.4",