Document move from `cryptohash` to `cryptonite`

[gasi]

First of all, thanks for providing this library. I am a Haskell beginner and first stumbled upon cryptohash and only later found your blog post about the consolidation to cryptonite. Could you please add a link to your blog post in the README.md as well as the Hackage page so newcomers know about cryptonite? Thanks.

P.S. Let me know if you’d prefer me to open a PR.

[angerman]

I just ran into the same issue. When browsing packages, finding cryptohash and cryptonite, an no deprecation note (as with some other package), is really confusing.

[rvion]

@vincenthz I also wish you could deprecate cryptohash

as you did for cprng-aes for instance

As of now, it's not direclty clear that cryptohash should be avoided

[vincenthz]

It's now deprecated almost everywhere (cabal header, README, ..), apart from officially from hackage. it's still fully functional and still willing to maintain it, as they are many users of it, which is the only reason why I don't flip the switch.

[angerman]

I've run into minor issues with packages using cryptohash, when I was using cryptonite, ending up with incompatible, yet identically named, data structures. Package imports solve this to a certain degree.

Isn't cryptonite a superset and almost a stand-in replacement for crytpohash? Or am I missing something?