async setSubject(newSubject) {
        const success = await this._setChannelMetadata({ name: newSubject }, { editName: true });
        success && (this.name = newSubject);
        return success;
    }
Updates the channel subject
@param {string} newSubject 
@returns {Promise<boolean>} Returns true if the subject was properly updated. This can return false if the user does not have the necessary permissions.