Merge pull request #41 from mconf/dependabot/bundler/rack-2.2.3

Bump rack from 1.6.11 to 2.2.3

Author: wpramio

Gemfile.lock

@@ -53,7 +53,7 @@ GEM
     multi_json (1.3.4)
     nokogiri (1.10.4)
       mini_portile2 (~> 2.4.0)
-    rack (1.6.11)
+    rack (2.2.3)
     rack-test (0.6.1)
       rack (>= 1.0)
     rake (0.9.2.2)