chore(package): update nock to version 2.15.0

http://greenkeeper.io/

Author: greenkeeperio-bot

package.json

@@ -49,7 +49,7 @@
   },
   "devDependencies": {
     "faucet": "0.0.1",
-    "nock": "2.13.0",
+    "nock": "2.15.0",
     "pre-commit": "1.1.1",
     "proxyquire": "1.7.3",
     "sinon": "1.17.1",