Introduce comparing with namespace support.

src/disco.rs

@@ -370,6 +370,7 @@ impl From<DiscoItemsResult> for Element {
 #[cfg(test)]
 mod tests {
     use super::*;
+    use compare_elements::NamespaceAwareCompare;
     use std::str::FromStr;
 
     #[test]
@@ -394,7 +395,7 @@ mod tests {
         assert_eq!(query.extensions[0].form_type, Some(String::from("example")));
 
         let elem2 = query.into();
-        assert_eq!(elem1, elem2);
+        assert!(elem1.compare_to(&elem2));
     }
 
     #[test]