chore(package): update babel-loader to version 8.0.3

Closes #49

Author: greenkeeper[bot]

package.json

@@ -39,7 +39,7 @@
     "babel-core": "^6.21.0",
     "babel-eslint": "^8.0.0",
     "babel-jest": "^23.0.1",
-    "babel-loader": "^7.1.1",
+    "babel-loader": "^8.0.3",
     "babel-plugin-transform-object-rest-spread": "^6.20.2",
     "babel-preset-es2015": "^6.18.0",
     "babel-preset-react": "^6.16.0",