Fix the return type of Server#owner
Fix the return type of Server#owner

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