Update dependency eslint-plugin-flowtype to v3.7.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
eslint-plugin-flowtype	devDependencies	minor	3.6.1 -> 3.7.0	source

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Release Notes

gajus/eslint-plugin-flowtype

### [`v3.7.0`](https://togithub.com/gajus/eslint-plugin-flowtype/releases/v3.7.0) [Compare Source](https://togithub.com/gajus/eslint-plugin-flowtype/compare/v3.6.1...v3.7.0) ##### Features - add annotateUndefined: 'ignore' option ([#​399](https://togithub.com/gajus/eslint-plugin-flowtype/issues/399)) ([714a995](https://togithub.com/gajus/eslint-plugin-flowtype/commit/714a995))

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