using MAX instead of previous expreasion

ext_open/searcher.py

@@ -29,7 +29,7 @@ class Searcher:
             )
         self.commit()
     def update(self,update_mtimes):
-        self.cur.execute('SELECT update_time FROM updates WHERE ext=? ORDER BY update_time DESC LIMIT 1;',[self.ext])
+        self.cur.execute('SELECT MAX(update_time) FROM updates WHERE ext=?;',[self.ext])
         last_update = self.cur.fetchone()[0]
         # input(str(last_update))
         _time = int(time.time())