_getUrl( channel ) {
		const chat = hasOwnProperty.call( this.context, "url" )
			? this.context.url
			: "default";
		const url = hasOwnProperty.call( twitchChatUrl, chat )
			? twitchChatUrl[ chat ]
			: twitchChatUrl.default;

		return url.replace( "{channel}", channel );
	}
Get the Twitch chat URL
@param {string} channel
@returns {string}