chore(package): update babelify to version 8.0.0

Author: greenkeeper[bot]

package.json

@@ -16,7 +16,7 @@
   },
   "devDependencies": {
     "babel-preset-es2015": "^6.24.1",
-    "babelify": "^7.3.0",
+    "babelify": "^8.0.0",
     "browserify": "^14.4.0",
     "chai": "^4.0.2",
     "coveralls": "^2.13.1",