properly close rss feed

src/model/log.rs

@@ -41,6 +41,8 @@ LIMIT 1000
             ret.push_str(&format!("({}) {}", log.created_at, log.msg));
             ret.push_str("</item>");
         }
+        ret.push_str("</channel>");
+        ret.push_str("</rss>");
         ret
     }
 }