Update dependency concurrently to v5

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	New value	References	Sourcegraph
concurrently	devDependencies	major	^5.1.0	source

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Release Notes

kimmobrunfeldt/concurrently

### [`v5.1.0`](https://togithub.com/kimmobrunfeldt/concurrently/releases/v5.1.0) [Compare Source](https://togithub.com/kimmobrunfeldt/concurrently/compare/v5.0.2...v5.1.0) - Return exit codes in the programmatic API ([#​213](https://togithub.com/kimmobrunfeldt/concurrently/issues/213)) ### [`v5.0.2`](https://togithub.com/kimmobrunfeldt/concurrently/releases/v5.0.2) [Compare Source](https://togithub.com/kimmobrunfeldt/concurrently/compare/v5.0.1...v5.0.2) - Update dependencies to get rid of [vulnerability in `tree-kill`](https://snyk.io/vuln/SNYK-JS-TREEKILL-536781) ### [`v5.0.1`](https://togithub.com/kimmobrunfeldt/concurrently/releases/v5.0.1) [Compare Source](https://togithub.com/kimmobrunfeldt/concurrently/compare/v5.0.0...v5.0.1) - Upgrade dependencies to get rid of [vulnerability in `os-locale`](https://snyk.io/test/npm/os-locale/3.0.0) ([#​204](https://togithub.com/kimmobrunfeldt/concurrently/issues/204), [#​205](https://togithub.com/kimmobrunfeldt/concurrently/issues/205)) - bin: remove duplicate entries from usage docs ([#​192](https://togithub.com/kimmobrunfeldt/concurrently/issues/192)) ### [`v5.0.0`](https://togithub.com/kimmobrunfeldt/concurrently/releases/v5.0.0) [Compare Source](https://togithub.com/kimmobrunfeldt/concurrently/compare/v4.1.2...v5.0.0) ### Breaking changes - Timestamp formatting library [`date-fns` was upgraded to v2.0.0](https://togithub.com/date-fns/date-fns/blob/master/CHANGELOG.md#​200---2019-08-20) ([#​196](https://togithub.com/kimmobrunfeldt/concurrently/issues/196)) ### Other changes - Kill child processes on `SIGHUP` ([#​193](https://togithub.com/kimmobrunfeldt/concurrently/issues/193), [#​195](https://togithub.com/kimmobrunfeldt/concurrently/issues/195)) ### [`v4.1.2`](https://togithub.com/kimmobrunfeldt/concurrently/releases/v4.1.2) [Compare Source](https://togithub.com/kimmobrunfeldt/concurrently/compare/v4.1.1...v4.1.2) - Don't strip quotes if they are impaired ([#​118](https://togithub.com/kimmobrunfeldt/concurrently/issues/118), [#​194](https://togithub.com/kimmobrunfeldt/concurrently/issues/194)) ### [`v4.1.1`](https://togithub.com/kimmobrunfeldt/concurrently/releases/v4.1.1) [Compare Source](https://togithub.com/kimmobrunfeldt/concurrently/compare/v4.1.0...v4.1.1) - bin: pass `--prefix-length` argument through ([#​189](https://togithub.com/kimmobrunfeldt/concurrently/issues/189))

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