Re-add Bot#stop for a more graceful close
Re-add Bot#stop for a more graceful close

VxJasonxV/discordrb,megumisonoda/discordrb,megumisonoda/discordrb,Roughsketch/discordrb,meew0/discordrb,VxJasonxV/discordrb,meew0/discordrb,Roughsketch/discordrb