Merge pull request #61 from ruby/dependabot/bundler/rack-2.0.8

Bump rack from 2.0.6 to 2.0.8

Author: hsbt

Gemfile.lock

@@ -113,7 +113,7 @@ GEM
     parser (2.3.3.1)
       ast (~> 2.2)
     public_suffix (3.0.3)
-    rack (2.0.6)
+    rack (2.0.8)
     rack-livereload (0.3.17)
       rack
     rake (12.3.1)