Dependency for console io version check

Dependency for this library can only be made if you are on ruby 1.9.3 or
later.

Author: developingchris

lib/thor/shell/basic.rb

@@ -1,5 +1,5 @@
 require 'tempfile'
-require 'io/console'
+require 'io/console' if RUBY_VERSION > '1.9.2'
 
 class Thor
   module Shell