Add MessageEvent#drain to clear out the saved message
Add MessageEvent#drain to clear out the saved message

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