Hello,

I was trying to use bollard to create a container with a gw_priority, but received the following error:

Docker responded with status code 400: invalid JSON: json: cannot unmarshal number 0.0 into Go struct field EndpointSettings.NetworkingConfig.EndpointsConfig.GwPriority of type int

I'm not sure why this was chosen, but gw_priority takes an Option<f64> (https://docs.rs/bollard/latest/bollard/secret/struct.EndpointSettings.html#structfield.gw_priority). Since the daemon can't handle floats, I'd suggest moving to a u64 instead. Can you please fix this?