message: use new cryptoxide library
diff: @@ -206,8 +206,8 @@ impl Entropy {
  }
  fn hash(&self) -> [u8;32] {
  - use rcw::digest::Digest;
  - use rcw::sha2::Sha256;
  + use cryptoxide::digest::Digest;
  + use cryptoxide::sha2::Sha256;
  let mut hasher = Sha256::new();
  let mut res = [0u8;32];
  hasher.input(self.as_ref());
  