Add MeterPro device support (#24)

* add MeterPro physical device type

* add CO2 field

Author: SlashNephy

device.go

@@ -167,6 +167,7 @@ type DeviceStatus struct {
 	Battery                int                  `json:"battery"`
 	Version                DeviceVersion        `json:"version"`
 	Direction              string               `json:"direction"`
+	CO2                    int                  `json:"CO2"`
 }
 
 type PowerState string

switchbot.go

@@ -102,10 +102,12 @@ const (
 	IndoorCam PhysicalDeviceType = "Indoor Cam"
 	// PanTiltCam is SwitchBot Pan/Tilt Cam Model No. W1801200
 	PanTiltCam PhysicalDeviceType = "Pan/Tilt Cam"
-	//PanTiltCam2K is SwitchBot Pan/Tilt Cam 2K Model No. W3101100
+	// PanTiltCam2K is SwitchBot Pan/Tilt Cam 2K Model No. W3101100
 	PanTiltCam2K PhysicalDeviceType = "Pan/Tilt Cam 2K"
 	// BlindTilt is SwitchBot Blind Tilt Model No. W2701600
 	BlindTilt PhysicalDeviceType = "Blind Tilt"
+	// MeterPro is SwitchBot CO2 Sensor Model No. W4900010
+	MeterPro PhysicalDeviceType = "MeterPro"
 )
 
 type VirtualDeviceType string