Commits on Dec 2, 2019

1. secrecy/zeroize: Upgrade to bytes v0.5 …

   - Removes the `bytes-preview` feature from `zeroize`
   - Upgrades `secrecy` to use `bytes` v0.5
   
   Now that `bytes` v0.5 is out, I've opened a PR to upstream the `Zeroize`
   impl for `BytesMut`:
   
   tokio-rs/bytes#335
   
   Unfortunately it's no-longer possible to impl `Zeroize` for `Bytes` as
   of `bytes` v0.5, as the `try_mut` method was dropped in this PR:
   
   tokio-rs/bytes#298
   
   I have brought this up on the first PR.
   
   In the meantime, this vendors the previous `BytesMut` impl of `Zeroize`
   into `secrecy`'s `SecretBytesMut` type, and drops `SecretBytes` as it's
   no-longer possible to implement.

   

   tony-iqlusion committed Dec 2, 2019
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2. MSRV 1.39+ …

   `bytes` v0.5 now needs Rust 1.39.
   
   1.39 is a pretty foundational release in terms of adding `async`/`await`
   and we need to be able to target that in various ways ASAP.
   
   Note this change is to the documented/supported/tested MSRV. Crates will
   continue working on a lower-than-advertised MSRV for now.

   

   tony-iqlusion committed Dec 2, 2019
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