Missing Sticker Property on DiscordMessage

Created by: jeffreyladd

Summary

Discord Implemented Stickers on Discord Message.

Details

The Object Definition can be found https://discord.com/developers/docs/resources/channel#message-object-message-sticker-structure while the Property added can be found https://discord.com/developers/docs/resources/channel#message-object-message-structure

Currently Bots can only receive messages with stickers and cannot send them