Merge pull request #82 from ruby/dependabot/bundler/rack-2.2.3

Bump rack from 2.2.2 to 2.2.3

Author: hsbt

Gemfile.lock

@@ -110,7 +110,7 @@ GEM
     parser (2.3.3.1)
       ast (~> 2.2)
     public_suffix (4.0.3)
-    rack (2.2.2)
+    rack (2.2.3)
     rack-livereload (0.3.17)
       rack
     rake (13.0.1)