Merge pull request #2 from github/rack-vuln-update

Update rack to v2.2.3.1 for security vulnerability

Author: northrup

Gemfile.lock

@@ -52,7 +52,7 @@ GEM
     parser (3.1.2.0)
       ast (~> 2.4.1)
     public_suffix (4.0.6)
-    rack (2.2.3)
+    rack (2.2.3.1)
     rainbow (3.1.1)
     rake (13.0.6)
     regexp_parser (2.4.0)
@@ -135,4 +135,4 @@ DEPENDENCIES
   webmock (= 3.4.2)
 
 BUNDLED WITH
-   2.2.24
+   2.3.5