ChatMember model. Valid subtypes: ChatMemberOwner, ChatMemberAdministrator, ChatMemberMember, ChatMemberRestricted, ChatMemberLeft, ChatMemberBanned
@type t() :: ExGram.Model.ChatMemberOwner.t() | ExGram.Model.ChatMemberAdministrator.t() | ExGram.Model.ChatMemberMember.t() | ExGram.Model.ChatMemberRestricted.t() | ExGram.Model.ChatMemberLeft.t() | ExGram.Model.ChatMemberBanned.t()