Prepare for new riscv releases

[romancardenas]

Closes #339

Closes #239 (no longer needed for ESP32 crates)

[bjoernQ]

I'm not a maintainer and not familiar with the release process here but this looks good to me.

Looking forward to the new release

[rmsyn]

Small clarifying question about the version bump in riscv-semihosting, otherwise LGTM.

[rmsyn]

minor nit: since this update includes a minor version bump in the riscv dependency, would that also justify a minor version bump in riscv-semihosting?

[romancardenas]

As different versions of riscv can coexist, and upgrading riscv to v0.15 does not modify how riscv-semihosting works, I think a minor bump is not necessary. In riscv-peripheral, as we are getting rid of a reexport, a minor bump is required.

Maybe I'm wrong and it's better to bump riscv-semhosting to v0.3.0 too.

[rmsyn]

It looks like the only place riscv is used inside riscv-semihosting is in the Cargo.toml. Am I missing something? Seems the dependency could be dropped altogether.

[MabezDev]

LGTM, thank you!