up firebase-functions version

functions/package.json

@@ -10,14 +10,14 @@
     "mock": "node ../scripts/generateMock.js"
   },
   "dependencies": {
+    "@babel/runtime": "^7.0.0",
     "body-parser": "^1.18.3",
     "express": "^4.16.3",
     "firebase-admin": "^5.12.1",
-    "firebase-functions": "^1.1.0",
+    "firebase-functions": "^2.0.5",
     "mockjs": "^1.0.1-beta3",
     "moment": "^2.22.2",
-    "path-to-regexp": "^2.2.1",
-    "@babel/runtime": "^7.0.0"
+    "path-to-regexp": "^2.2.1"
   },
   "private": true
 }