chore(package): update nock to version 12.0.0

Closes #62

Author: greenkeeper[bot]

package.json

@@ -33,7 +33,7 @@
   },
   "devDependencies": {
     "jest": "^24.8.0",
-    "nock": "^10.0.6",
+    "nock": "^12.0.0",
     "smee-client": "^1.1.0",
     "standard": "^13.1.0"
   }