chore(deps): update dependency eslint-plugin-react to ^7.12.4

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change	References
eslint-plugin-react	devDependencies	patch	^7.12.3 -> ^7.12.4	source

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Release Notes

yannickcr/eslint-plugin-react

### [`v7.12.4`](https://togithub.com/yannickcr/eslint-plugin-react/blob/master/CHANGELOG.md#​7124---2019-01-16) [Compare Source](https://togithub.com/yannickcr/eslint-plugin-react/compare/v7.12.3...v7.12.4) ##### Fixed - [`no-unused-prop-types`][]: avoid a crash ([#​2131][], [@​ljharb](https://togithub.com/ljharb)) - [`prop-types`][]: avoid further crashes from nonexistent nodes in unusedPropTypes ([#​2127][], [@​ljharb](https://togithub.com/ljharb)) - [`prop-types`][]: Read name of callee object ([#​2125][], [@​CrOrc](https://togithub.com/CrOrc)) - [`prop-types`][]: Ignore reassignments when matching props declarations with components ([#​2051][], [#​1957][], [@​yannickcr](https://togithub.com/yannickcr)) - [`prop-types`][], [`no-unused-prop-types`][], [`require-default-props`][]: Detect components with return statement in switch/case ([#​2118][], [@​yannickcr](https://togithub.com/yannickcr)) ##### Changed - [`prop-types`][], [`no-typos`][]: add passing test cases ([#​2123][], [#​2128][], [#​2136][], [#​2134][], [@​ljharb](https://togithub.com/ljharb)) [#​2136]: https://togithub.com/yannickcr/eslint-plugin-react/issues/2136 [#​2134]: https://togithub.com/yannickcr/eslint-plugin-react/issues/2134 [#​2131]: https://togithub.com/yannickcr/eslint-plugin-react/issues/2131 [#​2128]: https://togithub.com/yannickcr/eslint-plugin-react/issues/2128 [#​2127]: https://togithub.com/yannickcr/eslint-plugin-react/issues/2127 [#​2125]: https://togithub.com/yannickcr/eslint-plugin-react/pull/2125 [#​2123]: https://togithub.com/yannickcr/eslint-plugin-react/issues/2123 [#​2118]: https://togithub.com/yannickcr/eslint-plugin-react/issues/2118 [#​2051]: https://togithub.com/yannickcr/eslint-plugin-react/issues/2051 [#​1957]: https://togithub.com/yannickcr/eslint-plugin-react/issues/1957

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