pretty_json.ru in rack-pretty_json-1.0.0

- old
+ new

@@ -1,9 +1,8 @@
 $:.unshift File.expand_path("../../../lib/", __FILE__)
 
 require "rack"
 require "rack/pretty_json"
-require "stringio"
 
 module TestApp
 
   def self.call(env)
     status = 200