Remove unimplemented command from README [ci skip]
Remove unimplemented command from README [ci skip]

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