Require open3 unconditionally

Fixes #119

Author: avdv

lib/diffy.rb

@@ -1,11 +1,11 @@
 require 'tempfile'
 require 'erb'
 require 'rbconfig'
+require 'open3'
 
 module Diffy
   WINDOWS = (RbConfig::CONFIG['host_os'] =~ /mswin|mingw|cygwin/)
 end
-require 'open3' unless Diffy::WINDOWS
 require File.join(File.dirname(__FILE__), 'diffy', 'format')
 require File.join(File.dirname(__FILE__), 'diffy', 'html_formatter')
 require File.join(File.dirname(__FILE__), 'diffy', 'diff')