fix(package): update lodash to version 4.17.4

https://greenkeeper.io/

Author: greenkeeper[bot]

package.json

@@ -39,6 +39,6 @@
     "should": "11.1.2"
   },
   "dependencies": {
-    "lodash": "4.17.3"
+    "lodash": "4.17.4"
   }
 }