Suggest using /dev/serial/by-id

[jakewins]

I'm not sure you want to merge this, because I don't know if /dev/serial/by-id is a POSIX or a linux path; maybe this fix only helps linux users?

Either way, the example in the README did not work for me, because the device TTY ends up at /dev/ttyACM0 on my machine.

The command below resolves the device via the /dev/serial filesystem tree.

Thanks for building a cool tool!

[dotcypress]

Ok, I know how to fix that. Thank you for feedback 👍