chore(package): update lodash to version 4.15.0

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -27,7 +27,7 @@
     "ampersand-model": "^6.0.2",
     "ampersand-rest-collection": "^5.0.0",
     "async": "^1.5.2",
-    "lodash": "^4.8.2",
+    "lodash": "^4.15.0",
     "mongodb-js-errors": "^0.2.1",
     "mongodb-ns": "^1.0.3",
     "triejs": "github:rueckstiess/triejs"