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

Closes #36

Author: greenkeeper[bot]

package.json

@@ -39,7 +39,7 @@
   },
   "devDependencies": {
     "babel-core": "^6.26.3",
-    "babel-loader": "^7.1.2",
+    "babel-loader": "^8.0.2",
     "babel-preset-es2015": "^6.24.1",
     "chai": "^4.1.2",
     "chai-as-promised": "^7.1.1",