• Added new methods for working with stickers: getStickerSet, uploadStickerFile, createNewStickerSet, addStickerToSet, setStickerPositionInSet, and deleteStickerFromSet.
• Added the fields set_name and mask_position to the Sticker object, plus two new objects, StickerSet, and MaskPosition.
• Handle all GetUpdate fields in UpdatesHandler #105. Thanks @theskylineguy