chore(package): update babel-loader to version 8.0.0

Closes #91

Author: greenkeeper[bot]

package.json

@@ -56,7 +56,7 @@
   "devDependencies": {
     "auto-changelog": "0.3.1",
     "babel-core": "6.25.0",
-    "babel-loader": "7.1.1",
+    "babel-loader": "8.0.0",
     "babel-plugin-external-helpers": "6.22.0",
     "babel-polyfill": "6.23.0",
     "babel-preset-es2015": "6.24.1",