Upgrading jsonwebtoken library to latest version (#176)

Author: hiranya911

package-lock.json

@@ -54,7 +54,7 @@
     "@types/google-cloud__storage": "^1.1.1",
     "@types/node": "^8.0.53",
     "faye-websocket": "0.9.3",
-    "jsonwebtoken": "7.4.3",
+    "jsonwebtoken": "8.1.0",
     "node-forge": "0.7.1"
   },
   "devDependencies": {

package.json

@@ -458,7 +458,7 @@ describe('FirebaseTokenGenerator', () => {
 
     it('should be rejected given an ID token with no kid', () => {
       const mockIdToken = mocks.generateIdToken({
-        header: undefined,
+        header: {foo: 'bar'},
       });
       return tokenGenerator.verifyIdToken(mockIdToken)
         .should.eventually.be.rejectedWith('Firebase ID token has no "kid" claim');