Update dependencies (#30)

Author: laurenzlong

package.json

@@ -37,8 +37,8 @@
     "@types/chai": "^4.1.2",
     "@types/mocha": "^5.0.0",
     "chai": "^4.1.2",
-    "firebase-functions": ">1.0.1",
-    "firebase-admin": "^5.12.0",
+    "firebase-admin": "~6.1.0",
+    "firebase-functions": "^2.1.0",
     "mocha": "^5.0.5",
     "sinon": "^4.4.9",
     "tslint": "^5.8.0",