Merge pull request #12 from fdocr/dependabot/bundler/puma-5.6.4

Bump puma from 5.6.2 to 5.6.4

Author: fdocr

Gemfile.lock

@@ -17,7 +17,7 @@ GEM
     mustermann (1.1.1)
       ruby2_keywords (~> 0.0.1)
     nio4r (2.5.8)
-    puma (5.6.2)
+    puma (5.6.4)
       nio4r (~> 2.0)
     rack (2.2.3)
     rack-attack (6.6.0)