Commits on Oct 18, 2019

1. Upgrade signatory -> 0.15; yubihsm -> 0.28; use chacha20poly1305 crate …

   This commit updates `signatory` and `yubihsm` to the latest versions.
   
   This requires either upgrading *ring* to 0.16, or replacing it:
   
   informalsystems/tendermint-rs#11
   
   This commit has opted to replace it with the (i.e. my)
   `chacha20poly1305` crate:
   
   https://github.com/RustCrypto/AEADs/tree/master/chacha20poly1305
   
   While *ring* is a great crate with excellent cryptographic
   implementations, the inability to link two versions of `ring-asm` is a
   major impediment to doing upgrades, as it requires updating all
   *ring*-dependent dependencies at once, or not at all, which so far has
   been a major blocker and has been stalling KMS development for awhile.
   As we're only using it for ChaCha20Poly1305, it seems like a rather
   heavyweight dependency just to serve that one purpose.

   

   tony-iqlusion committed Oct 18, 2019
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