[python3] XML.save_xml: Open file in binary mode
[python3] XML.save_xml: Open file in binary mode

--HG--
extra : transplant_source : %DE%2A%3D%8B%B1%206%AC%C0%A4%EC%C5tQ%E7%D2%03%04%030

userzimmermann/robotframework,userzimmermann/robotframework,userzimmermann/robotframework,userzimmermann/robotframework,userzimmermann/robotframework