Bump puma from 4.0.1 to 4.1.0 (#55)

Bumps [puma](https://github.com/puma/puma) from 4.0.1 to 4.1.0.
- [Release notes](https://github.com/puma/puma/releases)
- [Changelog](https://github.com/puma/puma/blob/master/History.md)
- [Commits](puma/puma@v4.0.1...v4.1.0)

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

Gemfile.lock

@@ -28,7 +28,7 @@ GEM
     mustermann (1.0.3)
     nio4r (2.4.0)
     oj (3.8.1)
-    puma (4.0.1)
+    puma (4.1.0)
       nio4r (~> 2.0)
     rack (2.0.7)
     rack-protection (2.0.5)