screenshot.rb in win32screenshot-1.0.3

- old
+ new

@@ -1,6 +1,5 @@
 require 'ffi'
-require 'stringio' # this is needed for MiniMagick for now
 require 'mini_magick'
 ENV["RAUTOMATION_ADAPTER"] = "win_ffi" # make sure that WinFfi adapter is always used for RAutomation
 require 'rautomation'
 
 require File.dirname(__FILE__) + '/screenshot/take'