Update wowace/curse descriptions

[spiralofhope]

The description pages have a link to the old git repo

• http://www.wowace.com/addons/gnomishvendorshrinker/
• http://www.curse.com/addons/wow/gnomishvendorshrinker

http://github.com/tekkub/GnomishVendorShrinker/tree/master => https://github.com/TekNoLogic/GnomishVendorShrinker

[tekkub]

Yea, I know, I'm going to script this so I can update all my addons' readmes at the same time.