Discovery mode to chuangmi_camera.

[Om3rr]

Hey, I tried to discovery my chuangmi camera and when I tried to run
from miio.discovery import Discovery
Discovery.discover_mdns()

it raise
Found unsupported device chuangmi-camera-ipc009_miio263372670._miio._udp.local. at 10.0.0.26, please report to developers

[rytilahti]

Support for this was added in #516 so it will part of the next release. Meanwhile you can checkout the git master.