chore(deps): update dependency gts to v3

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
gts	^2.0.2 -> ^3.0.0

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Release Notes

google/gts

### [`v3.0.2`](https://togithub.com/google/gts/blob/master/CHANGELOG.md#​302-httpswwwgithubcomgooglegtscomparev301v302-2020-10-26) [Compare Source](https://togithub.com/google/gts/compare/v3.0.1...v3.0.2) ### [`v3.0.1`](https://togithub.com/google/gts/blob/master/CHANGELOG.md#​301-httpswwwgithubcomgooglegtscomparev300v301-2020-10-12) [Compare Source](https://togithub.com/google/gts/compare/v3.0.0...v3.0.1) ### [`v3.0.0`](https://togithub.com/google/gts/blob/master/CHANGELOG.md#​300-httpswwwgithubcomgooglegtscomparev202v300-2020-10-08) [Compare Source](https://togithub.com/google/gts/compare/v2.0.2...v3.0.0) ##### ⚠ BREAKING CHANGES - change default `check` to `lint` ([#​570](https://togithub.com/google/gts/issues/570)) - **deps:** require TypeScript 4.x ([#​565](https://togithub.com/google/gts/issues/565)) ##### Features - Add TypeScript v4 support ([#​551](https://www.github.com/google/gts/issues/551)) ([0883956](https://www.github.com/google/gts/commit/08839565a1d2b4b39d532c9b0b596f01b18856fe)) - change default `check` to `lint` ([#​570](https://www.github.com/google/gts/issues/570)) ([c527b66](https://www.github.com/google/gts/commit/c527b66be1ef6a78ea14b3d29225a8d7fb7097bd)) - generate .eslintignore when running init ([#​521](https://www.github.com/google/gts/issues/521)) ([8bce036](https://www.github.com/google/gts/commit/8bce0368767f0c2ad7d0700deb839962bc928d16)) ##### Bug Fixes - add build/.eslintrc.json to files field ([#​553](https://www.github.com/google/gts/issues/553)) ([3b516ad](https://www.github.com/google/gts/commit/3b516ad5e9f0d58201dde469461db7c6ed1c1b78)) - **deps:** require TypeScript 4.x ([#​565](https://www.github.com/google/gts/issues/565)) ([cbc5267](https://www.github.com/google/gts/commit/cbc5267579ef24e8c8ceaa2ef794df3ef54ea56a)) - **deps:** update dependency update-notifier to v5 ([#​574](https://www.github.com/google/gts/issues/574)) ([9a882bf](https://www.github.com/google/gts/commit/9a882bf4ac30ad06e7b91a65ad5721d8e8b41c4b)) - **deps:** update typescript-eslint monorepo to v2.34.0 ([#​509](https://www.github.com/google/gts/issues/509)) ([998a4ac](https://www.github.com/google/gts/commit/998a4ac9b75c97f04d8e5db37563f32d31652f23)) - **deps:** update typescript-eslint monorepo to v3 (major) ([#​528](https://www.github.com/google/gts/issues/528)) ([e22e173](https://www.github.com/google/gts/commit/e22e17338db2ddb7eb829c821037c2f4e77ff869)) - **deps:** update typescript-eslint monorepo to v4 ([#​556](https://www.github.com/google/gts/issues/556)) ([54148df](https://www.github.com/google/gts/commit/54148dfbd8b5f8b36a0f44f901c5db933393a661)) - better error message for broken tsconfig.json ([#​501](https://www.github.com/google/gts/issues/501)) ([0c17a76](https://www.github.com/google/gts/commit/0c17a76c6650eee1d8abaff11a897a432eeaa65f)) - prohibit calls for it.only and describe.only ([#​499](https://www.github.com/google/gts/issues/499)) ([071c33c](https://www.github.com/google/gts/commit/071c33ceef0e3765166aaebf6ed4698167ac0f98)) ##### [2.0.2](https://www.github.com/google/gts/compare/v2.0.1...v2.0.2) (2020-05-11) ##### Bug Fixes - Revert 'update dependency eslint to v7'" ([#​507](https://www.github.com/google/gts/issues/507)) ([0f9950b](https://www.github.com/google/gts/commit/0f9950b273329dbcce5f3cc20864c3dcd076f08c)) - **deps:** pin release of eslint-typescript ([#​508](https://www.github.com/google/gts/issues/508)) ([bd86b42](https://www.github.com/google/gts/commit/bd86b42e2bb904d3765dee82262e4691a11b9958)) - **deps:** update dependency eslint to v7 ([#​504](https://www.github.com/google/gts/issues/504)) ([6aee159](https://www.github.com/google/gts/commit/6aee1595d0486ae2c7fd68d16b1b59c4c4015753)) ##### [2.0.1](https://www.github.com/google/gts/compare/v2.0.0...v2.0.1) (2020-05-07) ##### Bug Fixes - throw an error if running with an unsupported version of nodejs ([#​493](https://www.github.com/google/gts/issues/493)) ([94fdf1e](https://www.github.com/google/gts/commit/94fdf1eaed634aa73c3e44c7a3d9f1325f773b07)) - **deps:** update dependency meow to v7 ([#​502](https://www.github.com/google/gts/issues/502)) ([cf91cda](https://www.github.com/google/gts/commit/cf91cda1afab25759427511d3c97d0037d61c649))

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