Cleanup links in README
Cleanup links in README

guilherme/byebug,yui-knk/byebug,icebreaker/byebug,os97673/byebug,guilherme/byebug,k0kubun/byebug,deivid-rodriguez/byebug,ozydingo/byebug,icebreaker/byebug,deivid-rodriguez/byebug,yui-knk/byebug,saisai/byebug,guilherme/byebug,k0kubun/byebug,k0kubun/byebug,miamiruby/byebug,webdev1001/byebug,scalp42/byebug,scalp42/byebug,webdev1001/byebug,saisai/byebug,yui-knk/byebug,deivid-rodriguez/byebug,ozydingo/byebug,miamiruby/byebug,os97673/byebug