Add a CHANGELOG.md

Signed-off-by: Jens Reidel <adrian@travitia.xyz>

CHANGELOG.md

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+# 0.4.0 (unreleased)
+
+- Update `webpki` to 0.24 and `rust-webpki` to 0.101
+- `upgrade::Error` is now publicly accessible and can thus be matched on
+- `ClientBuilder` methods which perform a handshake now return a tuple of `(WebsocketStream, Response)` to retrieve e.g. response headers
+- Several types now implement `Debug`
+- `WebsocketStream` now implements `Stream`, therefore using `WebsocketStream::next` now requires having `StreamExt` in scope
+- Limits for frame and message size can be applied via `{ClientBuilder,ServerBuilder}::limits` to protect against malicious peers
+- Added support for NEON-accelerated frame (un)masking
+- The crate now specifies and validates a MSRV of Rust 1.64