Update dependency eslint-plugin-flowtype to v3

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	References
eslint-plugin-flowtype	devDependencies	major	2.50.3 -> 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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[codecov]

Codecov Report

Merging #196 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master    #196   +/-   ##
======================================
  Coverage    78.8%   78.8%           
======================================
  Files           7       7           
  Lines         184     184           
  Branches       41      41           
======================================
  Hits          145     145           
  Misses         26      26           
  Partials       13      13

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[KevinGrandon]

!merge