Bump gh-pages from 2.0.1 to 2.2.0

Bumps [gh-pages](https://github.com/tschaub/gh-pages) from 2.0.1 to 2.2.0.
- [Release notes](https://github.com/tschaub/gh-pages/releases)
- [Changelog](https://github.com/tschaub/gh-pages/blob/master/changelog.md)
- [Commits](tschaub/gh-pages@v2.0.1...v2.2.0)

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

Author: dependabot-preview[bot]

package.json

@@ -55,7 +55,7 @@
     "eslint": "5.16.0",
     "eslint-plugin-react": "7.12.4",
     "file-loader": "6.0.0",
-    "gh-pages": "2.0.1",
+    "gh-pages": "2.2.0",
     "html-loader": "1.1.0",
     "html-webpack-plugin": "3.2.0",
     "jest": "26.0.1",