fix(deps): update dependency @google-cloud/pubsub to v2 (#1201)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [@google-cloud/pubsub](https://togithub.com/googleapis/nodejs-pubsub) | dependencies | major | [`^1.0.0` -> `^2.0.0`](https://renovatebot.com/diffs/npm/@google-cloud%2fpubsub/1.7.3/2.0.0) |
| [@google-cloud/pubsub](https://togithub.com/googleapis/nodejs-pubsub) | devDependencies | major | [`^1.0.0` -> `^2.0.0`](https://renovatebot.com/diffs/npm/@google-cloud%2fpubsub/1.7.3/2.0.0) |

---

### Release Notes

<details>
<summary>googleapis/nodejs-pubsub</summary>

### [`v2.0.0`](https://togithub.com/googleapis/nodejs-pubsub/blob/master/CHANGELOG.md#&#8203;200-httpswwwgithubcomgoogleapisnodejs-pubsubcomparevv171v200-2020-05-20)

[Compare Source](https://togithub.com/googleapis/nodejs-pubsub/compare/v1.7.3...v2.0.0)

Please note that Node 8 is no longer supported, and Node 10 is the new minimum version of the runtime.

##### ⚠ BREAKING CHANGES

-   Please note that Node 8 is no longer supported, and Node 10 is the new minimum version of the runtime.
-   drop support for custom promises ([#&#8203;970](https://togithub.com/googleapis/nodejs-pubsub/issues/970))
-   convert to typescript ([#&#8203;923](https://togithub.com/googleapis/nodejs-pubsub/issues/923))
-   **deps:** update dependency [@&#8203;google-cloud/projectify](https://togithub.com/google-cloud/projectify) to v2 ([#&#8203;929](https://togithub.com/googleapis/nodejs-pubsub/issues/929))

##### Bug Fixes

-   **docs:** link to correct gaxOptions docs ([#&#8203;999](https://www.github.com/googleapis/nodejs-pubsub/issues/999)) ([312e318](https://www.github.com/googleapis/nodejs-pubsub/commit/312e318ceb36eafbeb487ede7e5dbf9ccd5dfb81))
-   regen protos and tests, formatting ([#&#8203;991](https://www.github.com/googleapis/nodejs-pubsub/issues/991)) ([e350b97](https://www.github.com/googleapis/nodejs-pubsub/commit/e350b97ad19e49e5fe52d5eeb1ad67c8bb6ddf33))
-   remove eslint, update gax, fix generated protos, run the generator ([#&#8203;955](https://www.github.com/googleapis/nodejs-pubsub/issues/955)) ([544a061](https://www.github.com/googleapis/nodejs-pubsub/commit/544a061b1b6d7fdc4051486c2b8ae5d14e1ec141))
-   remove unused dependencies ([#&#8203;998](https://www.github.com/googleapis/nodejs-pubsub/issues/998)) ([7b242a3](https://www.github.com/googleapis/nodejs-pubsub/commit/7b242a36212e0871b3918621fe9a5f51d1e6b733))
-   **close:** ensure in-flight messages are drained ([#&#8203;952](https://www.github.com/googleapis/nodejs-pubsub/issues/952)) ([93a2bd7](https://www.github.com/googleapis/nodejs-pubsub/commit/93a2bd726660b134fbd3e12335bfde29d13a2b78))
-   **deps:** update dependency [@&#8203;google-cloud/paginator](https://togithub.com/google-cloud/paginator) to v3 ([#&#8203;931](https://www.github.com/googleapis/nodejs-pubsub/issues/931)) ([b621854](https://www.github.com/googleapis/nodejs-pubsub/commit/b62185426b7f958ee41a1cff429bc5fb70635b4a))
-   **deps:** update dependency [@&#8203;google-cloud/precise-date](https://togithub.com/google-cloud/precise-date) to v2 ([#&#8203;934](https://www.github.com/googleapis/nodejs-pubsub/issues/934)) ([72b8d78](https://www.github.com/googleapis/nodejs-pubsub/commit/72b8d781ed3cbf9049101b9c2675f211fb3924ba))
-   **deps:** update dependency [@&#8203;google-cloud/projectify](https://togithub.com/google-cloud/projectify) to v2 ([#&#8203;929](https://www.github.com/googleapis/nodejs-pubsub/issues/929)) ([45d9880](https://www.github.com/googleapis/nodejs-pubsub/commit/45d988077d2db2fddbb4d22aac43c7f8a77e4dcc))
-   **deps:** update dependency [@&#8203;google-cloud/promisify](https://togithub.com/google-cloud/promisify) to v2 ([#&#8203;928](https://www.github.com/googleapis/nodejs-pubsub/issues/928)) ([3819877](https://www.github.com/googleapis/nodejs-pubsub/commit/3819877752d39cd042364bdd9ed01ff230aeed0b))
-   **deps:** update dependency google-auth-library to v6 ([#&#8203;935](https://www.github.com/googleapis/nodejs-pubsub/issues/935)) ([73fc887](https://www.github.com/googleapis/nodejs-pubsub/commit/73fc887c662b526690167286d2d5afda0cccad1b))

##### Build System

-   convert to typescript ([#&#8203;923](https://www.github.com/googleapis/nodejs-pubsub/issues/923)) ([2fc68ba](https://www.github.com/googleapis/nodejs-pubsub/commit/2fc68baff0cc2013468da7ef3dc8d547d4745989))

##### Miscellaneous Chores

-   drop support for custom promises ([#&#8203;970](https://www.github.com/googleapis/nodejs-pubsub/issues/970)) ([df462d3](https://www.github.com/googleapis/nodejs-pubsub/commit/df462d3dec4f733cb309eb6413aad382424e2125))

##### [1.7.1](https://www.github.com/googleapis/nodejs-pubsub/compare/v1.7.0...v1.7.1) (2020-04-06)

##### Bug Fixes

-   provide missing close() method in the generated gapic client ([#&#8203;941](https://www.github.com/googleapis/nodejs-pubsub/issues/941)) ([6bf8f14](https://www.github.com/googleapis/nodejs-pubsub/commit/6bf8f1481a1dea051c47697488e13b6facf20a26))

</details>

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package.json

@@ -74,7 +74,7 @@
     "xdg-basedir": "^4.0.0"
   },
   "devDependencies": {
-    "@google-cloud/pubsub": "^1.0.0",
+    "@google-cloud/pubsub": "^2.0.0",
     "@grpc/grpc-js": "^1.0.3",
     "@grpc/proto-loader": "^0.5.1",
     "@types/compressible": "^2.0.0",

samples/package.json

@@ -16,7 +16,7 @@
     "test": "mocha system-test/*.js --timeout 600000"
   },
   "dependencies": {
-    "@google-cloud/pubsub": "^1.0.0",
+    "@google-cloud/pubsub": "^2.0.0",
     "@google-cloud/storage": "^5.0.1",
     "uuid": "^8.0.0",
     "yargs": "^15.0.0"