Land rapid7#3626, @wchen-r7's storing of text loot as txt

Author: jhart-r7

lib/msf/core/auxiliary/report.rb

@@ -215,7 +215,7 @@ def store_loot(ltype, ctype, host, data, filename=nil, info=nil, service=nil)
     end
 
     case ctype
-    when "text/plain"
+    when /^text\/[\w\.]+$/
       ext = "txt"
     end
     # This method is available even if there is no database, don't bother checking