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

Closes #13

Author: greenkeeper[bot]

package.json

@@ -20,7 +20,7 @@
   "devDependencies": {
     "babel-core": "^6.26.0",
     "babel-jest": "^21.0.0",
-    "babel-loader": "^7.1.2",
+    "babel-loader": "^8.0.3",
     "babel-plugin-transform-async-to-generator": "^6.24.1",
     "babel-polyfill": "^6.26.0",
     "babel-preset-es2015": "^6.24.1",