Add a missing include and require statement for psh

modules/exploits/multi/script/web_delivery.rb

@@ -4,10 +4,12 @@
 ##
 
 require 'msf/core'
+require 'msf/core/exploit/powershell'
 
 class Metasploit3 < Msf::Exploit::Remote
   Rank = ManualRanking
 
+  include Msf::Exploit::Powershell
   include Msf::Exploit::Remote::HttpServer
 
   def initialize(info = {})