Update react to the latest version � (#843)

Summary:
## There have been updates to the *react* monorepo:

- The `dependency` [react](https://github.com/facebook/react) was updated from `16.12.0` to `16.13.0`.
- The `dependency` [react-dom](https://github.com/facebook/react) was updated from `16.12.0` to `16.13.0`.
- The `dependency` [react-test-renderer](https://github.com/facebook/react) was updated from `16.12.0` to `16.13.0`.

These versions are **not covered** by your **current version range**.

If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update.

This monorepo update includes releases of one or more dependencies which all belong to the [react group definition](https://github.com/greenkeeperio/monorepo-definitions).

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**Publisher:** [threepointone](https://www.npmjs.com/~threepointone)
**License:** MIT

[Find out more about this release](https://github.com/facebook/react).

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<details>
  <summary>FAQ and help</summary>

  There is a collection of [frequently asked questions](https://greenkeeper.io/faq.html). If those don’t help, you can always [ask the humans behind Greenkeeper](https://github.com/greenkeeperio/greenkeeper/issues/new).
</details>

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Your [Greenkeeper](https://greenkeeper.io) bot 🌴
Pull Request resolved: https://github.com/facebook/flipper/pull/843

Reviewed By: mweststrate

Differential Revision: D20303301

Pulled By: passy

fbshipit-source-id: 3d2a65d6b85e5a451ba41a4ae17532887a83e240

package.json

@@ -196,15 +196,15 @@
     "promisify-child-process": "^3.1.3",
     "prop-types": "^15.6.0",
     "query-string": "^6.10.1",
-    "react": "16.12.0",
+    "react": "16.13.0",
     "react-color": "^2.11.7",
     "react-debounce-render": "^6.0.0",
     "react-devtools-core": "^4.0.6",
-    "react-dom": "^16.12.0",
+    "react-dom": "^16.13.0",
     "react-markdown": "^4.2.2",
     "react-player": "^1.15.2",
     "react-redux": "^7.1.1",
-    "react-test-renderer": "^16.12.0",
+    "react-test-renderer": "^16.13.0",
     "react-transition-group": "^4.3.0",
     "react-virtualized-auto-sizer": "^1.0.2",
     "react-window": "^1.3.1",