Update text-moderation sample to SDK v.03.0

Change-Id: I2db0e6b8f5920907b89fcf2a1c7a08735e2d2eaf

text-moderation/functions/index.js

@@ -23,7 +23,7 @@ const filter = new BadWordsFilter();
 
 // Moderates messages by lowering all uppercase messages and removing swearwords.
 exports.moderator = functions.database()
-    .path('/messages/{messageId}').on('write', event => {
+    .path('/messages/{messageId}').onWrite(event => {
       const message = event.data.val();
 
       if (message && !message.sanitized) {

text-moderation/functions/package.json

@@ -3,7 +3,7 @@
   "dependencies": {
     "bad-words": "^1.3.1",
     "capitalize-sentence": "^0.1.2",
-    "firebase": "^3.4.0",
+    "firebase": "^3.4.1",
     "firebase-functions": "https://storage.googleapis.com/firebase-preview-drop/node/firebase-functions/firebase-functions-preview.latest.tar.gz"
   }
 }