Update dependency grunt-concurrent to v3 - autoclosed

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
grunt-concurrent	~2.2.1 -> ~3.0.0

---

Release Notes

sindresorhus/grunt-concurrent (grunt-concurrent)

### [`v3.0.0`](https://togithub.com/sindresorhus/grunt-concurrent/releases/tag/v3.0.0) [Compare Source](https://togithub.com/sindresorhus/grunt-concurrent/compare/v2.3.1...v3.0.0) Breaking: - Require Node.js 8 and Grunt 1 [`468aec3`](https://togithub.com/sindresorhus/grunt-concurrent/commit/468aec3) Enhancements: - Add `indent` option ([#​101](https://togithub.com/sindresorhus/grunt-concurrent/issues/101)) [`f8e1fd9`](https://togithub.com/sindresorhus/grunt-concurrent/commit/f8e1fd9) ### [`v2.3.1`](https://togithub.com/sindresorhus/grunt-concurrent/compare/v2.3.0...v2.3.1) [Compare Source](https://togithub.com/sindresorhus/grunt-concurrent/compare/v2.3.0...v2.3.1) ### [`v2.3.0`](https://togithub.com/sindresorhus/grunt-concurrent/compare/v2.2.1...v2.3.0) [Compare Source](https://togithub.com/sindresorhus/grunt-concurrent/compare/v2.2.1...v2.3.0)

---

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• [ ] If you want to rebase/retry this PR, check this box

---

This PR has been generated by Mend Renovate. View repository job log here.