fix pylint warning '(old-style-class) Old-style class defined.'

This warning is ignored for classes from PyJSLib, because library
overrides base object class.

<?xml version='1.0' encoding='utf-8'?>
<BeremizRoot xmlns:xsd="http://www.w3.org/2001/XMLSchema" URI_location="LOCAL://">
  <TargetType/>
</BeremizRoot>