add author name to Patrik's IPP library

nselib/ipp.lua

@@ -12,6 +12,7 @@ _ENV = stdnse.module("ipp", stdnse.seeall)
 --
 -- A small CUPS ipp (Internet Printing Protocol) library implementation
 --
+-- @author Patrik Karlsson
 --
 
 -- The IPP layer
@@ -437,4 +438,4 @@ Helper = {
 	end,
 }
 
-return _ENV;
+return _ENV;