Bump react-dom from 16.0.0 to 16.4.2 (#1779)

Bumps [react-dom](https://github.com/facebook/react) from 16.0.0 to 16.4.2.
- [Release notes](https://github.com/facebook/react/releases)
- [Changelog](https://github.com/facebook/react/blob/master/CHANGELOG.md)
- [Commits](facebook/react@v16.0.0...v16.4.2)

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

package.json

@@ -62,7 +62,7 @@
     "postcss-cli": "^4.1.1",
     "prop-types": "^15.6.2",
     "react": "16.0.0",
-    "react-dom": "16.0.0",
+    "react-dom": "16.4.2",
     "react-ga": "2.5.3",
     "shelljs": "^0.8.2",
     "shx": "^0.2.2",