Use the configured domain in the notify_owners email subject

Author: paolobarbolini

src/email.rs

@@ -117,8 +117,10 @@ pub fn notify_owners(
     publisher_email: &str,
 ) {
     let subject = format!(
-        "Crate {} ({}) published to crates.io",
-        crate_name, crate_version
+        "Crate {} ({}) published to {}",
+        crate_name,
+        crate_version,
+        crate::config::domain_name()
     );
     let body = format!(
         "A crate you have publish access to has recently released a new version.