Update rand_core to 0.6 and rand to 0.8

[dconnolly]

No description provided.

[teor2345]

Looks like a duplicate of #42 @dconnolly ?

[dconnolly]

Looks like a duplicate of #42 @dconnolly ?

I reverted that merge as I realized that would be a backwards-incompatible API change, requiring a major version update. But looking at #40, now that we checkpoint on Canopy, I guess we don't need to worry about the 1.0 series anymore, and just bump to 3.0?

[teor2345]

Looks like a duplicate of #42 @dconnolly ?

I reverted that merge as I realized that would be a backwards-incompatible API change, requiring a major version update. But looking at #40, now that we checkpoint on Canopy, I guess we don't need to worry about the 1.0 series anymore, and just bump to 3.0?

As long as we don't change the 1.x branch (the pre-Canopy branch), we can do whatever we like to the main branch.

And for Zebra specifically, we should only be using the main branch.

I'm not sure if anyone else is using our fork of ed25519-zebra.

[dconnolly]

Looks like this does not in fact require our dependency curve25519-dalek to support the same version of rand/rand_core: we abstract it away, use rand/rand_core, and pass the resulting bytes to any -dalek types. Merging, created #45 to do the 3.0 release soon.