Update dependency eslint-plugin-flowtype to v5.8.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
eslint-plugin-flowtype	5.7.2 -> 5.8.0

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Release Notes

gajus/eslint-plugin-flowtype

### [`v5.8.0`](https://togithub.com/gajus/eslint-plugin-flowtype/releases/v5.8.0) [Compare Source](https://togithub.com/gajus/eslint-plugin-flowtype/compare/v5.7.2...v5.8.0) ##### Features - add new rule enforce-line-break ([#​484](https://togithub.com/gajus/eslint-plugin-flowtype/issues/484)) ([417068c](https://togithub.com/gajus/eslint-plugin-flowtype/commit/417068cb33f3c2b016d87a520f3146e83e26e184))

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