chore(deps): update dependency eslint-plugin-react to v7.21.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
eslint-plugin-react	devDependencies	minor	7.20.6 -> 7.21.0

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Release Notes

yannickcr/eslint-plugin-react

### [`v7.21.0`](https://togithub.com/yannickcr/eslint-plugin-react/blob/master/CHANGELOG.md#​7210---20200922) [Compare Source](https://togithub.com/yannickcr/eslint-plugin-react/compare/v7.20.6...v7.21.0) ##### Added - [`button-has-type`]: support trivial ternary expressions ([#​2748][] [@​Hypnosphi](https://togithub.com/Hypnosphi)) - [`jsx-handler-names`]: add `checkInlineFunction` option ([#​2761][] [@​dididy](https://togithub.com/dididy)) - [`jsx-no-literals`]: add `noAttributeStrings` option ([#​2782][] [@​TaLeaMonet](https://togithub.com/TaLeaMonet)) - [`prop-types`]: add support for `PropTypes.exact` ([#​2740][] [@​jzabala](https://togithub.com/jzabala)) - [`jsx-filename-extension`]: Add allow option ([#​2746][] [@​remcohaszing](https://togithub.com/remcohaszing)) ##### Fixed - [`function-component-definition`]: ignore object properties ([#​2771][] [@​stefan-wullems](https://togithub.com/stefan-wullems)) - [`forbid-component-props`]: Implemented support for "namespaced" components ([#​2767][] [@​mnn](https://togithub.com/mnn)) - [`prefer-read-only-props`]: support Flow `$ReadOnly` ([#​2772][], [#​2779][], [#​2770][] [@​karolina-benitez](https://togithub.com/karolina-benitez)) - [`jsx-handler-names`]: handle whitespace ([#​2789][] [@​AriPerkkio](https://togithub.com/AriPerkkio)) - [`prop-types`]: Detect TypeScript types for destructured default prop values ([#​2780][] [@​sunghyunjo](https://togithub.com/sunghyunjo)) - [`jsx-pascal-case`]: Handle single character namespaced component ([#​2791][] [@​daviferreira](https://togithub.com/daviferreira)) - [`jsx-closing-bracket-location`]: In `tag-aligned`, made a distinction between tabs and spaces ([#​2796][] [@​Moong0122](https://togithub.com/Moong0122)) - [`jsx-handler-names`]: false positive when handler name begins with number ([#​1689][] [@​jsphstls](https://togithub.com/jsphstls)) - [`prop-types`]: Detect JSX returned by sequential expression ([#​2801][] [@​mikol](https://togithub.com/mikol)) - [`jsx-props-no-multi-spaces`]: "Expected no line gap between" false positive ([#​2792][] [@​karolina-benitez](https://togithub.com/karolina-benitez)) - [`no-unknown-property`]: check attributes with any input case ([#​2790][] [@​julienw](https://togithub.com/julienw)) - [`prop-types`]/[`no-unused-prop-types`]: handle CallExpression in ReturnType ([#​2802][] [@​hank121314](https://togithub.com/hank121314)) - [`jsx-uses-react`]: mark fragment variables as used ([#​2775][] [@​remcohaszing](https://togithub.com/remcohaszing)) - [`no-unused-prop-types`]: improve component declared props detection ([#​2755][] [@​jzabala](https://togithub.com/jzabala)) - [`jsx-props-no-multi-spaces`]: Show error in multi-line props ([#​2756][] [@​iiison](https://togithub.com/iiison)) ##### Changed - [Tests][`jsx-one-expression-per-line`]: add passing tests ([#​2799][] [@​TaLeaMonet](https://togithub.com/TaLeaMonet)) - [Tests][`prop-types`]: add test ([#​2757][] [@​jzabala](https://togithub.com/jzabala)) [#​2802]: https://togithub.com/yannickcr/eslint-plugin-react/pull/2802 [#​2801]: https://togithub.com/yannickcr/eslint-plugin-react/pull/2801 [#​2799]: https://togithub.com/yannickcr/eslint-plugin-react/pull/2799 [#​2796]: https://togithub.com/yannickcr/eslint-plugin-react/pull/2796 [#​2792]: https://togithub.com/yannickcr/eslint-plugin-react/pull/2792 [#​2791]: https://togithub.com/yannickcr/eslint-plugin-react/pull/2791 [#​2790]: https://togithub.com/yannickcr/eslint-plugin-react/pull/2790 [#​2789]: https://togithub.com/yannickcr/eslint-plugin-react/pull/2789 [#​2782]: https://togithub.com/yannickcr/eslint-plugin-react/pull/2782 [#​2780]: https://togithub.com/yannickcr/eslint-plugin-react/pull/2780 [#​2779]: https://togithub.com/yannickcr/eslint-plugin-react/pull/2779 [#​2775]: https://togithub.com/yannickcr/eslint-plugin-react/pull/2775 [#​2772]: https://togithub.com/yannickcr/eslint-plugin-react/pull/2772 [#​2771]: https://togithub.com/yannickcr/eslint-plugin-react/pull/2771 [#​2770]: https://togithub.com/yannickcr/eslint-plugin-react/pull/2770 [#​2767]: https://togithub.com/yannickcr/eslint-plugin-react/pull/2767 [#​2761]: https://togithub.com/yannickcr/eslint-plugin-react/pull/2761 [#​2757]: https://togithub.com/yannickcr/eslint-plugin-react/pull/2757 [#​2756]: https://togithub.com/yannickcr/eslint-plugin-react/pull/2756 [#​2748]: https://togithub.com/yannickcr/eslint-plugin-react/pull/2748 [#​2746]: https://togithub.com/yannickcr/eslint-plugin-react/pull/2746 [#​2740]: https://togithub.com/yannickcr/eslint-plugin-react/pull/2740 [#​1689]: https://togithub.com/yannickcr/eslint-plugin-react/pull/1689

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