Bump react-dom from 16.4.2 to 16.6.1

Bumps [react-dom](https://github.com/facebook/react) from 16.4.2 to 16.6.1.
- [Release notes](https://github.com/facebook/react/releases)
- [Changelog](https://github.com/facebook/react/blob/master/CHANGELOG.md)
- [Commits](facebook/react@v16.4.2...v16.6.1)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot-support

package-lock.json

@@ -36,7 +36,7 @@
     "prismjs": "^1.15.0",
     "prop-types": "^15.6.2",
     "react": "^16.5.2",
-    "react-dom": "^16.4.2",
+    "react-dom": "^16.6.1",
     "react-helmet": "^5.2.0",
     "slugify": "^1.3.1",
     "string.prototype.includes": "^1.0.0",