generic-array bustage

[martinthomson]

RustCrypto/traits#2036 details what is going on.

Presumably, this crate will need to track any changes that the underlying crates use as well, because it has a direct dependency on generic-array.

[rozbb]

Gonna use this opportunity to upgrade to hybrid-array as hinted in #55

[rozbb]

@martinthomson Just merged #82. Do you wanna check to see if this fixes your build?

[martinthomson]

Seems to check out: martinthomson/ohttp#90

(I'll probably want to wait for things to stabilize further in terms of concrete releases, but this looks to be solid.)

[rozbb]

Wonderful! I’ll cut a prerelease. Once rand_core finally stabilizes (it’s been a long effort), I’ll cut a proper release. Thank you for your work!

[rozbb]

Resolved in #82