Add a method to join a server using an invite, fixes #15
Add a method to join a server using an invite, fixes #15

brpeterman/discordrb,meew0/discordrb,VxJasonxV/discordrb,VxJasonxV/discordrb,sarsntony/discordrb,sarsntony/discordrb,megumisonoda/discordrb,Roughsketch/discordrb,Roughsketch/discordrb,megumisonoda/discordrb,meew0/discordrb,brpeterman/discordrb