update grbl-servo to v1.1

[hankso]

Hi robottini,
grbl has updated to v1.1
I am developing a subject using grbl and I need servo support, however some new features in grbl v1.1 are also necessary.
So do you have a plan to add servo support to grbl v1.1 or not?
If so, please notice me, maybe I can help you.

[lavolpecheprogramma]

@hankso grbl v1.1h with servo support https://github.com/lavolpecheprogramma/grbl-1-1h-servo