Fix links in CHANGELOG [ci skip]
Fix links in CHANGELOG [ci skip]

Plus other minor stuff.

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