chore(package): update babel-loader to version 7.1.5

Closes #48

Author: greenkeeper[bot]

package.json

@@ -26,7 +26,7 @@
   "devDependencies": {
     "babel-cli": "6.26.0",
     "babel-eslint": "8.0.1",
-    "babel-loader": "7.1.2",
+    "babel-loader": "7.1.5",
     "babel-plugin-transform-class-properties": "6.24.1",
     "babel-preset-env": "1.6.1",
     "babel-preset-react": "6.24.1",