Support Serialport version ^10

[alana314]

Thanks for your work on this project!
Serialport post version 10 has some different syntax that causes it not to work with node-dmx. I'll submit a PR in a few for the enttec-usb-dmx-pro.js driver.

[taste5]

Could this pleased be rolled out. As it is open for over a year and we recently updated our project to use serialport^10. And now DMX support is broke due to this issue

[wiedi]

Finally got around to looking into this, sorry. Version 0.25.x now depends on serialport ^11.