Update dependency eslint-plugin-flowtype to v3

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
eslint-plugin-flowtype	peerDependencies	major	^2.36.0 -> ^3.0.0	source

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Release Notes

gajus/eslint-plugin-flowtype

v3.0.0

Compare Source

Features

• add mixed to no-weak-types (#​362) (5e2bbe9)

BREAKING CHANGES

• mixed is now treated as a weak type by default.

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[KevinGrandon]

!merge