Update react-dev-utils requirement to ^5.0.1 in /services/client (#52)

Updates the requirements on [react-dev-utils](https://github.com/facebookincubator/create-react-app) to permit the latest version.
- [Release notes](https://github.com/facebookincubator/create-react-app/releases)
- [Changelog](https://github.com/facebook/create-react-app/blob/next/CHANGELOG.md)
- [Commits](https://github.com/facebookincubator/create-react-app/commits)

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

services/client/package.json

@@ -27,7 +27,7 @@
     "prop-types": "^15.6.0",
     "query-string": "^6.0.0",
     "react": "^15.6.2",
-    "react-dev-utils": "^4.0.1",
+    "react-dev-utils": "^5.0.1",
     "react-dom": "^15.6.2",
     "react-fontawesome": "^1.6.1",
     "react-redux": "^5.0.6",