Merge pull request #52 from splitrb/dependabot/bundler/rack-2.2.2

[Security] Bump rack from 2.0.8 to 2.2.2

Author: andrehjr

Gemfile.lock

@@ -3,7 +3,7 @@ GEM
   specs:
     mustermann (1.1.0)
       ruby2_keywords (~> 0.0.1)
-    rack (2.0.8)
+    rack (2.2.2)
     rack-protection (2.0.8.1)
       rack
     redis (4.1.3)