Reload Remind files if the mtime is newer

def _update(self):
        """Reload Remind files if the mtime is newer"""
        update = not self._reminders

        with self._lock:
            for fname in self._reminders:
                if getmtime(fname) > self._mtime:
                    update = True
                    break

            if update:
                self._reminders = self._parse_remind(self._filename)