Bump rack from 2.2.2 to 2.2.3 (#7)

Bumps [rack](https://github.com/rack/rack) from 2.2.2 to 2.2.3.
- [Release notes](https://github.com/rack/rack/releases)
- [Changelog](https://github.com/rack/rack/blob/master/CHANGELOG.md)
- [Commits](https://github.com/rack/rack/compare/v2.2.2...2.2.3)

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Gemfile.lock

@@ -53,7 +53,7 @@ GEM
       oauth2 (~> 1.1)
       omniauth (~> 1.9)
     public_suffix (3.0.3)
-    rack (2.2.2)
+    rack (2.2.3)
     rake (13.0.1)
     rspec (3.8.0)
       rspec-core (~> 3.8.0)