Support for ATtiny85

[oyvindkinsey]

For larger production runs, Atmega MCU's are often overkill for this application, and so a smaller MCU such as the ATtiny85 would be better suited.
Reserving two pins for communication with external components, three triacs can still be controlled, making this an extremely efficient solution.

Unless existing work on this exists, I'll be forking this repo in order to provide the applicable configuration needed to make this work.

[loehrc]

Hi,
did you make any progress on this? I'm unable to compile the current code for an ATtiny85