Append 'ws://' prefix if url starts with localhost (#132)

* test: refactor NormalizeURL tests

* feat(NormalizeURL): add 'ws://' prefix if url starts with 'localhost'

* test(NormalizeURL): add 'ws://' prefix if url is localhost

normalize.go

@@ -15,6 +15,10 @@ func NormalizeURL(u string) string {
 	u = strings.TrimSpace(u)
 	u = strings.ToLower(u)
 
+	if strings.HasPrefix(u, "localhost") == true {
+		u = "ws://" + u
+	}
+
 	if !strings.HasPrefix(u, "http") && !strings.HasPrefix(u, "ws") {
 		u = "wss://" + u
 	}