Bump react-dev-utils from 10.2.1 to 11.0.4

Bumps [react-dev-utils](https://github.com/facebook/create-react-app/tree/HEAD/packages/react-dev-utils) from 10.2.1 to 11.0.4.
- [Release notes](https://github.com/facebook/create-react-app/releases)
- [Changelog](https://github.com/facebook/create-react-app/blob/master/CHANGELOG-1.x.md)
- [Commits](https://github.com/facebook/create-react-app/commits/HEAD/packages/react-dev-utils)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

packages/flow-runtime-docs/package.json

@@ -58,7 +58,7 @@
     "promise": "7.1.1",
     "react": "^15.4.1",
     "react-codemirror2": "^7.2.1",
-    "react-dev-utils": "^10.2.1",
+    "react-dev-utils": "^11.0.4",
     "react-dom": "^15.4.1",
     "react-router": "^3.0.0",
     "recast": "^0.11.18",