fix(deps): update dependency @google-cloud/pubsub to ^0.29.0 (#714)

Author: renovate[bot]

package.json

@@ -71,7 +71,7 @@
     "xdg-basedir": "^4.0.0"
   },
   "devDependencies": {
-    "@google-cloud/pubsub": "^0.28.0",
+    "@google-cloud/pubsub": "^0.29.0",
     "@types/async": "^2.0.49",
     "@types/compressible": "^2.0.0",
     "@types/concat-stream": "^1.6.0",

samples/package.json

@@ -16,7 +16,7 @@
     "test": "mocha system-test/*.js --timeout 600000"
   },
   "dependencies": {
-    "@google-cloud/pubsub": "^0.28.0",
+    "@google-cloud/pubsub": "^0.29.0",
     "@google-cloud/storage": "^2.5.0",
     "uuid": "^3.3.2",
     "yargs": "^13.0.0"