Upgraded nock to 9.x (#188)

* Upgraded nock to 9.x

* Upgraded nock version

Author: hiranya911

package-lock.json

@@ -63,7 +63,7 @@
     "@types/firebase-token-generator": "^2.0.28",
     "@types/lodash": "^4.14.85",
     "@types/mocha": "^2.2.32",
-    "@types/nock": "^8.0.33",
+    "@types/nock": "^9.1.0",
     "@types/request": "2.0.6",
     "@types/request-promise": "^4.1.33",
     "@types/sinon": "^4.1.2",
@@ -85,7 +85,7 @@
     "lodash": "^4.6.1",
     "merge2": "^1.0.2",
     "mocha": "^3.5.0",
-    "nock": "^8.0.0",
+    "nock": "^9.1.0",
     "npm-run-all": "^4.1.2",
     "nyc": "^11.3.0",
     "request": "^2.75.0",