noise-rust-crypto: make it work on no_std (#18)
noise-rust-crypto: make it work on no_std (#18)

The default features of the sha2 and noise_protocol deps pull in
std. They are not needed in noise-rust-crypto to implement the traits.

Co-authored-by: Yin Guanhao <a751eec6f9454d349e20fa94e7c6883ec44498d0@users.noreply.github.com>
sopium/noise-rust