chore(package): update lodash to version 4.15.0

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -24,7 +24,7 @@
   },
   "dependencies": {
     "debug": "2.2.0",
-    "lodash": "4.13.1",
+    "lodash": "4.15.0",
     "shelljs": "0.7.0",
     "write-json-file": "2.0.0"
   }