fix(slickvpn/updater): update existing hostnames from servers.json

- SlickVPN location website is now total garbage which cannot be parsed

internal/updater/html/match.go

@@ -22,6 +22,12 @@ func MatchData(data string) MatchFunc {
 	}
 }
 
+func MatchClasses(classStrings ...string) MatchFunc {
+	return func(node *html.Node) (match bool) {
+		return HasClassStrings(node, classStrings...)
+	}
+}
+
 func DirectChild(parent *html.Node,
 	matchFunc MatchFunc,
 ) (child *html.Node) {