Migrate to pasta_curves 0.3, blake2b_simd 1

[str4d]

Also removes the unused digest dependency.

[daira]

utACK modulo the external_doc failure.

[krnak]

Hello, I made some changes to add no-std support for this crate. May you check and merge #11 before releasing version 0.2?

[codecov-commenter]

Codecov Report

Merging #10 (95c0527) into main (093087e) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #10   +/-   ##
=======================================
  Coverage   86.75%   86.75%           
=======================================
  Files          15       15           
  Lines        1148     1148           
=======================================
  Hits          996      996           
  Misses        152      152           

[dconnolly]

🎉

[dconnolly]

Hello, I made some changes to add no-std support for this crate. May you check and merge #11 before releasing version 0.2?

I have changes to suggest for the (much larger) no_std PR, that can go out as 0.3 or 0.2.1 or something

[str4d]

Yeah, the no-std changes will be backwards-compatible as long as std remains enabled by default, so can easily be an 0.2.1 release.