Resolve rapid7#4986, add support for IE11 for fingerprint_user_agent

Resolve rapid7#4986

Author: wchen-r7

lib/msf/core/exploit/http/server.rb

@@ -305,7 +305,7 @@ def fingerprint_user_agent(ua_str)
       when /opera\/(\d+(:?\.\d+)*)/
         fp[:ua_name] = HttpClients::OPERA
         fp[:ua_ver] = $1
-      when /mozilla\/[0-9]+\.[0-9] \(compatible; msie ([0-9]+\.[0-9]+)/
+      when /mozilla\/[0-9]+\.[0-9] \(compatible; msie ([0-9]+\.[0-9]+)/, /mozilla\/[0-9]+\.[0-9] \(.+ rv:([0-9]+\.[0-9])\)/
         fp[:ua_name] = HttpClients::IE
         fp[:ua_ver] = $1
       else