fix(package): update babel-loader to version 8.0.2

Closes #30

Author: greenkeeper[bot]

package.json

@@ -26,7 +26,7 @@
   },
   "dependencies": {
     "babel-core": "~6.18.2",
-    "babel-loader": "6.2.7",
+    "babel-loader": "8.0.2",
     "babel-preset-react-hmre": "^1.1.1",
     "babel-plugin-react-transform": "2.0.2",
     "babel-preset-es2015": "^6.9.0",