[miio] add support for zhimi.humidifier.ca4 (Smartmi Evaporative Air Humidifier 2) (#9093)
* miio: add support for zhimi.humidifier.ca4 This change adds support for Xiaomi Smartmi Evaporation Air Humidifier 2. The device uses MIOT protocol, exact spec is available at: http://miot-spec.org/miot-spec-v2/instance?type=urn:miot-spec-v2:device:humidifier:0000A00E:zhimi-ca4:2 Signed-off-by: Marek Skrobacki <skrobul@skrobul.com>
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