chore(package): update lodash to version 4.13.1

https://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -36,7 +36,7 @@
     "chai": "^3.5.0",
     "fs-blob-store": "^5.2.1",
     "idb-plus-blob-store": "^1.1.2",
-    "lodash": "^4.12.0",
+    "lodash": "^4.13.1",
     "ncp": "^2.0.0",
     "pre-commit": "^1.1.2",
     "rimraf": "^2.5.2"