aes: bump ctr dependency to v0.8

[newpavlov]

No description provided.

[tarcieri]

If you want to cut a breaking release, there are a few other changes I'd like to get in (mostly cleaning up the hazmat module which kind of grew organically alongside the deoxys crate)

[newpavlov]

Nah, I don't plan doing an aes release in the near future (this is why I've used "unreleased" in the changelog). Also I don't think this change warrants a breaking release. ctr v0.8 was released only because of the breaking changes in the flavor trait. The Ctr type got more general, so it should be backwards compatible API-wise. aes exposes only already instantiated CTR types. Interface for those is defined via traits from the same cipher v0.3 (there are also 2 inherent methods, but they are left unchanged from ctr v0.7). Thus, I think it's fine to do a patch release here.