Merge #164: Add v0.11.0 release notes

b283a80 Add v0.11.0 release notes (Tobin C. Harding)

Pull request description:

  The version has already been bumped. Add release notes in preparation for doing the release.

  I mimiced the recent changelog format used in `rust-secp` to do this one. Please do not take me writing these release notes for an implication that I know exactly whats going on :) I just went through ever PR since the last release since there was only on screen worth of them.

  This PR could be treated as the release tracking issue.

ACKs for top commit:
  apoelstra:
    ACK b283a80

Tree-SHA512: 0123ed85c0794ad1b9d55fc21e6949fd70a78d5de4dc90daefce0d620d1953fc6bc2a363c94b7d831d037ed06c89975c466cf78b67c9ef02c06d5c4a3b71f747

CHANGELOG.md

@@ -1,4 +1,31 @@
 
+# 0.11.0 - 2022-06-25
+
+The major change in this version is the increase of the Minimum Supported Rust Version (MSRV) from
+1.29 to 1.41.1. This is a big change because it introduces Rust Edition 2018 to the codebase along
+with all the benefits that brings. We also did a bunch of optimisations to speed up encoding and
+decoding hex strings.
+
+## Breaking changes
+
+* [Enable edition 2018 and bump MSRV to Rust 1.41.1](https://github.com/rust-bitcoin/bitcoin_hashes/pull/136)
+
+## New features/APIs
+
+* [Add `all_zeros` to `Hash` trait](https://github.com/rust-bitcoin/bitcoin_hashes/pull/148)
+* [Implement `Write` on `HmacEngine`](https://github.com/rust-bitcoin/bitcoin_hashes/pull/133)
+* [Introduce `HexWriter`](https://github.com/rust-bitcoin/bitcoin_hashes/pull/156), makes serialising hex faster
+* [Implement `Read` on `HexIterator`](https://github.com/rust-bitcoin/bitcoin_hashes/pull/135), makes deserialising hex faster
+
+## Other improvements
+
+* Use `rotate_left` [instead of custom macro](https://github.com/rust-bitcoin/bitcoin_hashes/pull/162)
+* [Enable clippy on CI](https://github.com/rust-bitcoin/bitcoin_hashes/pull/152)
+* Various docs fixes
+* [Improve feature test coverage](https://github.com/rust-bitcoin/bitcoin_hashes/pull/147)
+* [Add a disabled `rustfmt.toml`](https://github.com/rust-bitcoin/bitcoin_hashes/pull/141) to improve interaction with auto-formatting in editors
+
+
 # 0.10.0 - 2021-07-05
 
 * Increase `core2` to released version of 0.3.0