chore(package): update babel-register to version 6.11.6 (#2089)

https://greenkeeper.io/ [skip ci]

Author: greenkeeperio-bot

Diff for: package.json

@@ -56,7 +56,7 @@
   "devDependencies": {
     "babel-plugin-transform-class-properties": "^6.9.0",
     "babel-preset-es2015": "^6.6.0",
-    "babel-register": "^6.6.5",
+    "babel-register": "^6.11.6",
     "chai": "^3.2.0",
     "del": "^2.2.0",
     "grunt": "^1.0.1",