Get discord bot owner id

function getOwnerID() {
    if (this.options.ownerid) return this.options.ownerid;
    if (this.options.owner.id) return this.options.owner.id;
    if (this.options.owner && this.options.owner.username) return this.options.owner;
    throw new Error(`Unable to resolve owner ID, please set the \`ownerID\` option.`);
}