chore(package): update babel-loader to version 8.1.0

Closes #78

Author: greenkeeper[bot]

package.json

@@ -53,7 +53,7 @@
   "devDependencies": {
     "babel-cli": "^6.24.1",
     "babel-core": "^6.24.0",
-    "babel-loader": "^7.0.0",
+    "babel-loader": "^8.1.0",
     "babel-plugin-incremental-dom": "^3.4.0",
     "babel-plugin-istanbul": "^4.1.1",
     "babel-plugin-transform-react-jsx": "^6.22.0",