chore(deps): update dependency gts to v2.0.0 (googleapis#154)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
| [gts](https://github.com/google/gts) | devDependencies | patch | [`2.0.0-alpha.9` -> `2.0.0`](https://renovatebot.com/diffs/npm/gts/2.0.0-alpha.9/2.0.0) |

---

### Release Notes

<details>
<summary>google/gts</summary>

### [`v2.0.0`](https://github.com/google/gts/blob/master/CHANGELOG.md#&#8203;200-httpswwwgithubcomgooglegtscomparev112v200-2020-04-02)

[Compare Source](https://github.com/google/gts/compare/39a2705e51b4b6329a70f91f8293a2d7a363bf5d...v2.0.0)

##### ⚠ BREAKING CHANGES ⚠

This is a major rewrite of the tool.  Based on community guidance, we've switched from using [tslint](https://palantir.github.io/tslint/) to [eslint](https://eslint.org/).  _Please read all of the steps below to upgrade_.

##### Configuring `eslint`

With the shift to `eslint`, `gts` now will format and lint JavaScript _as well_ as TypeScript. Upgrading will require a number of manual steps.  To format JavaScript and TypeScript, you can run:

    $ npx gts fix

To specify only TypeScript:

    $ npx gts fix '**/*.ts'

##### Delete `tslint.json`

This file is no longer used, and can lead to confusion.

##### Create a `.eslintrc.json`

Now that we're using eslint, you need to extend the eslint configuration baked into the module.  Create a new file named `.eslintrc.json`, and paste the following:

```js
{
  "extends": "./node_modules/gts"
}
```

##### Create a `.eslintignore`

The `.eslintignore` file lets you ignore specific directories.  This tool now lints and formats JavaScript, so it's _really_ important to ignore your build directory!  Here is an example of a `.eslintignore` file:

    **/node_modules
    build/

##### Rule changes

The underlying linter was changed, so naturally there are going to be a variety of rule changes along the way.  To see the full list, check out [.eslintrc.json](https://github.com/google/gts/blob/master/.eslintrc.json).

##### Require Node.js 10.x and up

Node.js 8.x is now end of life - this module now requires Ndoe.js 10.x and up.

##### Features

-   add the eol-last rule ([#&#8203;425](https://www.github.com/google/gts/issues/425)) ([50ebd4d](https://www.github.com/google/gts/commit/50ebd4dbaf063615f4c025f567ca28076a734223))
-   allow eslintrc to run over tsx files ([#&#8203;469](https://www.github.com/google/gts/issues/469)) ([a21db94](https://www.github.com/google/gts/commit/a21db94601def563952d677cb0980a12b6730f4c))
-   disable global rule for checking TODO comments ([#&#8203;459](https://www.github.com/google/gts/issues/459)) ([96aa84a](https://www.github.com/google/gts/commit/96aa84a0a42181046daa248750cc8fef0c320619))
-   override require-atomic-updates ([#&#8203;468](https://www.github.com/google/gts/issues/468)) ([8105c93](https://www.github.com/google/gts/commit/8105c9334ee5104b05f6b1b2f150e51419637262))
-   prefer single quotes if possible ([#&#8203;475](https://www.github.com/google/gts/issues/475)) ([39a2705](https://www.github.com/google/gts/commit/39a2705e51b4b6329a70f91f8293a2d7a363bf5d))
-   use eslint instead of tslint ([#&#8203;400](https://www.github.com/google/gts/issues/400)) ([b3096fb](https://www.github.com/google/gts/commit/b3096fbd5076d302d93c2307bf627e12c423e726))

##### Bug Fixes

-   use .prettierrc.js ([#&#8203;437](https://www.github.com/google/gts/issues/437)) ([06efa84](https://www.github.com/google/gts/commit/06efa8444cdf1064b64f3e8d61ebd04f45d90b4c))
-   **deps:** update dependency chalk to v4 ([#&#8203;477](https://www.github.com/google/gts/issues/477)) ([061d64e](https://www.github.com/google/gts/commit/061d64e29d37b93ce55228937cc100e05ddef352))
-   **deps:** update dependency eslint-plugin-node to v11 ([#&#8203;426](https://www.github.com/google/gts/issues/426)) ([a394b7c](https://www.github.com/google/gts/commit/a394b7c1f80437f25017ca5c500b968ebb789ece))
-   **deps:** update dependency execa to v4 ([#&#8203;427](https://www.github.com/google/gts/issues/427)) ([f42ef36](https://www.github.com/google/gts/commit/f42ef36709251553342e655e287e889df72ee3e3))
-   **deps:** update dependency prettier to v2 ([#&#8203;464](https://www.github.com/google/gts/issues/464)) ([20ef43d](https://www.github.com/google/gts/commit/20ef43d566df17d3c93949ef7db3b72ee9123ca3))
-   disable no-use-before-define ([#&#8203;431](https://www.github.com/google/gts/issues/431)) ([dea2c22](https://www.github.com/google/gts/commit/dea2c223d1d3a60a1786aa820eebb93be27016a7))
-   **deps:** update dependency update-notifier to v4 ([#&#8203;403](https://www.github.com/google/gts/issues/403)) ([57393b7](https://www.github.com/google/gts/commit/57393b74c6cf299e8ae09311f0382226b8baa3e3))
-   **deps:** upgrade to meow 6.x ([#&#8203;423](https://www.github.com/google/gts/issues/423)) ([8f93d00](https://www.github.com/google/gts/commit/8f93d0049337a832d9a22b6ae4e86fd41140ec56))
-   align back to the google style guide ([#&#8203;440](https://www.github.com/google/gts/issues/440)) ([8bd78c4](https://www.github.com/google/gts/commit/8bd78c4c78526a72400f618a95a987d2a7c1a8db))
-   disable empty-function check ([#&#8203;467](https://www.github.com/google/gts/issues/467)) ([6455d7a](https://www.github.com/google/gts/commit/6455d7a9d227320d3ffe1b00c9c739b846f339a8))
-   drop support for node 8 ([#&#8203;422](https://www.github.com/google/gts/issues/422)) ([888c686](https://www.github.com/google/gts/commit/888c68692079065f38ce66ec84472f1f3311a050))
-   emit .prettierrc.js with init ([#&#8203;462](https://www.github.com/google/gts/issues/462)) ([b114614](https://www.github.com/google/gts/commit/b114614d22ab5560d2d1dd5cb6695968cc80027b))
-   enable trailing comma ([#&#8203;470](https://www.github.com/google/gts/issues/470)) ([6518f58](https://www.github.com/google/gts/commit/6518f5843d3093e3beb7d3371b56d9aecedf3924))
-   include _.tsx and _.jsx in default fix command ([#&#8203;473](https://www.github.com/google/gts/issues/473)) ([0509780](https://www.github.com/google/gts/commit/050978005ad089d9b3b5d8895b25ea1175d75db2))

##### [1.1.2](https://www.github.com/google/gts/compare/v1.1.1...v1.1.2) (2019-11-20)

##### Bug Fixes

-   **deps:** update to newest prettier (with support for optional chain) ([#&#8203;396](https://www.github.com/google/gts/issues/396)) ([ce8ad06](https://www.github.com/google/gts/commit/ce8ad06c8489c44a9e2ed5292382637b3ebb7601))

##### [1.1.1](https://www.github.com/google/gts/compare/v1.1.0...v1.1.1) (2019-11-11)

##### Bug Fixes

-   **deps:** update dependency chalk to v3 ([#&#8203;389](https://www.github.com/google/gts/issues/389)) ([1ce0f45](https://www.github.com/google/gts/commit/1ce0f450677e143a27efc39def617d13c66503e8))
-   **deps:** update dependency inquirer to v7 ([#&#8203;377](https://www.github.com/google/gts/issues/377)) ([bf2c349](https://www.github.com/google/gts/commit/bf2c349b2208ac63e551542599ac9cd27b461338))
-   **deps:** update dependency rimraf to v3 ([#&#8203;374](https://www.github.com/google/gts/issues/374)) ([2058eaa](https://www.github.com/google/gts/commit/2058eaa682f4baae978b469fd708d1f866e7da74))
-   **deps:** update dependency write-file-atomic to v3 ([#&#8203;353](https://www.github.com/google/gts/issues/353)) ([59e6aa8](https://www.github.com/google/gts/commit/59e6aa8580a2f8e9457d2d2b6fa9e18e86347592))

</details>

---

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package.json

@@ -36,7 +36,7 @@
     "eslint-config-prettier": "^6.0.0",
     "eslint-plugin-node": "^11.0.0",
     "eslint-plugin-prettier": "^3.0.0",
-    "gts": "2.0.0-alpha.9",
+    "gts": "2.0.0",
     "jsdoc": "^3.6.2",
     "jsdoc-fresh": "^1.0.1",
     "jsdoc-region-tag": "^1.0.2",