Merge pull request #70 from Kimtaro/dependabot/bundler/rack-2.2.22

Bump rack from 2.2.20 to 2.2.22

Author: Kimtaro

Gemfile.lock

@@ -10,7 +10,7 @@ GEM
       metaclass (~> 0.0.1)
     mustermann (2.0.2)
       ruby2_keywords (~> 0.0.1)
-    rack (2.2.20)
+    rack (2.2.22)
     rack-cors (1.0.5)
       rack (>= 1.6.0)
     rack-protection (2.2.3)