Added require to post/windows

Author: jamesbcook

lib/msf/core/post/windows.rb

@@ -9,6 +9,7 @@ module Msf::Post::Windows
   require 'msf/core/post/windows/process'
   require 'msf/core/post/windows/railgun'
   require 'msf/core/post/windows/registry'
+  require 'msf/core/post/windows/runas'
   require 'msf/core/post/windows/services'
   require 'msf/core/post/windows/shadowcopy'
   require 'msf/core/post/windows/user_profiles'