fix(deps): update dependency pubsub to ^0.28 (#1231)

Author: chenyumic

appengine/pubsub/app.js

@@ -46,7 +46,7 @@ const messages = [];
 const PUBSUB_VERIFICATION_TOKEN = process.env.PUBSUB_VERIFICATION_TOKEN;
 const TOPIC = process.env.PUBSUB_TOPIC;
 
-const publisher = pubsub.topic(TOPIC).publisher();
+const topic = pubsub.topic(TOPIC);
 
 // [START gae_flex_pubsub_index]
 app.get('/', (req, res) => {
@@ -61,7 +61,7 @@ app.post('/', formBodyParser, async (req, res, next) => {
 
   const data = Buffer.from(req.body.payload);
   try {
-    const messageId = await publisher.publish(data);
+    const messageId = await topic.publish(data);
     res.status(200).send(`Message ${messageId} sent.`);
   } catch (error) {
     next(error);

appengine/pubsub/package.json

@@ -13,7 +13,7 @@
     "test": "repo-tools test app && mocha */*.test.js --timeout=30000 --exit"
   },
   "dependencies": {
-    "@google-cloud/pubsub": "^0.22.0",
+    "@google-cloud/pubsub": "^0.28.0",
     "body-parser": "^1.18.3",
     "express": "^4.16.3",
     "pug": "^2.0.1",