Add URL parameter to enable notification of IP changes

src/ddns_service/email.py

@@ -94,7 +94,7 @@ class EmailService:
             logging.error(f"Email send failed: to={to} error={e}")
             return False
 
-    def send_changed_notification(
+    def send_change_notification(
         self,
         email,
         hostname,
@@ -135,8 +135,8 @@ class EmailService:
             "expiry_ttl": hostname.expiry_ttl,
         }
 
-        subject = f"DDNS hostname expired: {fqdn}"
-        body = self.expiry_template.render(**template_variables)
+        subject = f"DDNS hostname changed: {fqdn}"
+        body = self.change_template.render(**template_variables)
 
         return self.send(email, subject, body)