Allow sending multiple digit channel numbers in a single request

[misku]

To switch a channel to eg. 162 you had to make 3 separate API calls:

POST /hubs/:hub_slug/devices/:device_slug/commands/1 POST /hubs/:hub_slug/devices/:device_slug/commands/6 POST /hubs/:hub_slug/devices/:device_slug/commands/2

Now you can switch channels in a single request provided the chanel is an Integer:

POST /hubs/:hub_slug/devices/:device_slug/commands/162