fix bug in url from argument handling

examples/livecoding_cleaner.rs

@@ -14,7 +14,7 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
     let addr = std::env::args().nth(1)
 	.unwrap_or_else(|| "www.tmplab.org".to_string());
     
-    let links = get_links("https://tmplab.org").await?;
+    let links = get_links(addr.as_ref()).await?;
     let links : Vec<Url> = links.into_iter()
 	.filter(| url | url.host() != Some(Host::Domain(&addr)))
 	.collect();