support for RISC-V architecture

[efa]

I saw some asked for ARM support (#175), but RISC-V is rapidly growing and we need support for this architecture too

[TheAssassin]

There's no reason you can't build this tool on a RISC-V distribution, same goes for ARM. I encourage you to try yourself. Should there be problems, please don't hesitate to report these.

#175 is asking for official builds. I'm relatively certain that this is not something that will happen soon (even though it might be possible) because RISC-V is way less common than ARM. And, given the fact that I don't own any RISC-V devices I could possibly debug problems with, I'll be rejecting official builds for now.