Update eslint-plugin-react requirement to 7.9.1 (#10760)

Updates the requirements on [eslint-plugin-react](https://github.com/yannickcr/eslint-plugin-react) to permit the latest version.
<details>
<summary>Release notes</summary>

*Sourced from [eslint-plugin-react's releases](https://github.com/yannickcr/eslint-plugin-react/releases).*

> ## v7.9.1
> Nothing was fixed; this is a republish with some updated deps. ([#1804](https://github-redirect.dependabot.com/yannickcr/eslint-plugin-react/issues/1804) [**ljharb**](https://github.com/ljharb))
</details>
<details>
<summary>Changelog</summary>

*Sourced from [eslint-plugin-react's changelog](https://github.com/yannickcr/eslint-plugin-react/blob/master/CHANGELOG.md).*

> ## [7.9.1] - 2018-06-03
> * Nothing was fixed; this is a republish with some updated deps. ([#1804][] [**ljharb**](https://github.com/ljharb))
> 
> [#1804]: https://github-redirect.dependabot.com/yannickcr/eslint-plugin-react/issues/1804
> 
> ## [7.9.0] - 2018-06-03
> ### Added
> * Add [`jsx-props-no-multi-spaces`][] rule ([#1755][] [**ThiefMaster**](https://github.com/ThiefMaster))
> * Add `first` option to [`jsx-indent-props`][] ([#398][] [**ThiefMaster**](https://github.com/ThiefMaster))
> * Add `enforceDynamicLinks` option to [`jsx-no-target-blank`][] ([#1737][] [**kenearley**](https://github.com/kenearley))
> 
> ### Fixed
> * Fix static lifecycle methods validation in [`sort-comp`][] ([#1793][] [**lynxtaa**](https://github.com/lynxtaa))
> * Fix crash in [`no-typos`][] when encountering anonymous react imports ([#1796][] [**jsg2021**](https://github.com/jsg2021))
> * Fix ESLint 3 support ([#1779][])
> 
> ### Changed
> * Documentation improvements ([#1794][] [**lencioni**](https://github.com/lencioni))
> * Update Travis CI configuration to test on multiple ESLint verions
> 
> [7.9.0]: https://github.com/yannickcr/eslint-plugin-react/compare/v7.8.2...v7.9.0
> [#1755]: https://github-redirect.dependabot.com/yannickcr/eslint-plugin-react/pull/1755
> [#398]: https://github-redirect.dependabot.com/yannickcr/eslint-plugin-react/issues/398
> [#1737]: https://github-redirect.dependabot.com/yannickcr/eslint-plugin-react/issues/1737
> [#1793]: https://github-redirect.dependabot.com/yannickcr/eslint-plugin-react/issues/1793
> [#1796]: https://github-redirect.dependabot.com/yannickcr/eslint-plugin-react/pull/1796
> [#1779]: https://github-redirect.dependabot.com/yannickcr/eslint-plugin-react/issues/1779
> [#1794]: https://github-redirect.dependabot.com/yannickcr/eslint-plugin-react/pull/1794
> 
> ## [7.8.2] - 2018-05-13
> ### Fixed
> * Fix crash in [`boolean-prop-naming`][] when encountering a required shape prop type ([#1791][] [**pcorpet**](https://github.com/pcorpet))
> 
> [7.8.2]: https://github.com/yannickcr/eslint-plugin-react/compare/v7.8.1...v7.8.2
> [#1791]: https://github-redirect.dependabot.com/yannickcr/eslint-plugin-react/issues/1791
> 
> ## [7.8.1] - 2018-05-12
> ### Fixed
> * Fix crash in [`no-deprecated`][] when encountering a class constructor ([#1785][] [**taddei**](https://github.com/taddei))
> 
> [7.8.1]: https://github.com/yannickcr/eslint-plugin-react/compare/v7.8.0...v7.8.1
> [#1785]: https://github-redirect.dependabot.com/yannickcr/eslint-plugin-react/issues/1785
> 
> ## [7.8.0] - 2018-05-11
> ### Added
> * Add support for fragments to [`react-in-jsx-scope`][] ([#1758][])
> * Add support for Flow generic PropType to [`require-default-props`][] ([#1724][] [**Miziak**](https://github.com/Miziak))
> * Add component whitelist option to [`forbid-component-props`][] ([#1732][] [**ThiefMaster**](https://github.com/ThiefMaster))
> * Add support for React 16.3 lifecycle methods to [`no-unused-prop-types`][] ([#1681][] [**bvaughn**](https://github.com/bvaughn))
> * Add support for React 16.3 lifecycle methods to [`sort-comp`][] ([#1767][] [**joe-denea**](https://github.com/joe-denea))
></table> ... (truncated)
</details>
<details>
<summary>Commits</summary>

- See full diff in [compare view](https://github.com/yannickcr/eslint-plugin-react/commits/v7.9.1)
</details>
<br />

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting `@dependabot rebase`.

---

<details>
<summary>Dependabot commands and options</summary>
<br />

You can trigger Dependabot actions by commenting on this PR:
- `@dependabot rebase` will rebase this PR
- `@dependabot ignore this [patch|minor|major] version` will close this PR and stop Dependabot creating any more for this minor/major version (unless you reopen the PR or upgrade to it yourself)
- `@dependabot ignore this dependency` will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)
- `@dependabot use (this|these) label[s]` will set the current labels as the default for future PRs for this repo and language
- `@dependabot use (this|these) reviewer[s]` will set the current reviewers as the default for future PRs for this repo and language
- `@dependabot use (this|these) assignee[s]` will set the current assignees as the default for future PRs for this repo and language

Additionally, you can set the following in your Dependabot [dashboard](https://app.dependabot.com):
- Update frequency (including time of day and day of week)
- Automerge options (never/patch/minor, and dev/runtime dependencies)
- Pull request limits (per update run and/or open at any time)
- Out-of-range updates (receive only lockfile updates, if desired)
- Security updates (receive only security updates, if desired)

Finally, you can contact us by mentioning @dependabot.

</details>

package.json

@@ -122,7 +122,7 @@
     "eslint-plugin-import": "^2.2.0",
     "eslint-plugin-jsx-a11y": "^6.0.2",
     "eslint-plugin-markdown": "~1.0.0-beta.4",
-    "eslint-plugin-react": "7.8.2",
+    "eslint-plugin-react": "7.9.1",
     "eslint-tinker": "^0.4.0",
     "fetch-jsonp": "^1.0.3",
     "glob": "^7.1.1",