attempt to fix rss code

layouts/_default/rss.xml

@@ -20,7 +20,7 @@
 		{{end}}{{ if .Params.video}}
 		<enclosure url="{{.Params.video}}" />
 		{{end}}{{ if .Params.audio}}
-			{{if in .Params.adio "https://"}}
+			{{if in .Params.adio "https:"}}
 				<enclosure url="{{.Params.audio}}" />
 			{{else}}
 				<enclosure url="{{.Site.BaseURL}}{{.Params.audio}}" />