Upgrade firebase dependencies

Author: oskarrough

package.json

@@ -16,14 +16,14 @@
     "body-parser": "^1.17.2",
     "cors": "^2.8.4",
     "express": "^4.15.3",
-    "firebase-admin": "^5.10.0",
-    "firebase-functions": "^0.8.2",
+    "firebase-admin": "^6.2.0",
+    "firebase-functions": "^2.1.0",
     "got": "^6.7.1",
     "radio4000-sdk": "^0.1.0",
     "stripe": "^4.24.0"
   },
   "devDependencies": {
     "ava": "^0.21.0",
-    "firebase-tools": "^3.17.7"
+    "firebase-tools": "^6.1.1"
   }
 }