Use `generic-array` v1.0

[sinui0]

https://github.com/fizyk20/generic-array/pull/138 has been merged. Once RustCrypto crates adopt it, eg cipher, we should take advantage of this to get rid of transmutes in our Block impl introduced in #59

[novacrazy]

It looks like the RustCrypto people are moving to hybrid-array instead of generic-array 1.0, so you may want to petition them to add these methods instead, if they haven't already.

[sinui0]

It looks like the RustCrypto people are moving to hybrid-array instead of generic-array 1.0, so you may want to petition them to add these methods instead, if they haven't already.

Thanks for the heads up. It does seem their intention is to go straight to hybrid-array, I was assuming they would bump to generic-array 1.0 first.

[sinui0]

https://github.com/RustCrypto/utils/issues/951