checklink: please use another useragent string

Hello link checker team,
first of all, thank you for your free service. i wanted to run the link 
checker on my website which is protected against malicious web bots. The 
link checker visits the website with the substring "libwww-perl" in the 
useragent which is also used by many, many bad bots and therefore 
blocked. Can you modify the headers sent by your tool so there's no 
"libwww-perl" in it anymore? This will help other people for sure.
Thank you in advance,
-Jojo