chore(package): update lodash to version 4.12.0 (#52)

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -46,7 +46,7 @@
     "async": "~2.0.0-rc.3",
     "debug": "~2.2.0",
     "gravatar": "^1.0.6",
-    "lodash": "~4.11.1",
+    "lodash": "~4.12.0",
     "parse-link-header": "^0.4.1",
     "proxyquire": "^1.7.1",
     "step": "0.0.6",