Bump gem-release from 2.1.1 to 2.2.0

Bumps [gem-release](https://github.com/svenfuchs/gem-release) from 2.1.1 to 2.2.0.
- [Release notes](https://github.com/svenfuchs/gem-release/releases)
- [Changelog](https://github.com/svenfuchs/gem-release/blob/master/CHANGELOG.md)
- [Commits](svenfuchs/gem-release@v2.1.1...v2.2.0)

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

Gemfile.lock

@@ -11,7 +11,7 @@ GEM
     coderay (1.1.2)
     diff-lcs (1.3)
     docile (1.3.2)
-    gem-release (2.1.1)
+    gem-release (2.2.0)
     jaro_winkler (1.5.4)
     json (2.3.0)
     method_source (0.9.2)