docs: add CHANGELOG.md

CHANGELOG.md

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+# Change Log
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/)
+and this project adheres to [Semantic Versioning](http://semver.org/).
+
+## v0.4.3
+- connect request customizability([#25](https://github.com/gbaranski/ezsockets/pull/25)) with bearer authorization and custom headers.
+- allow passing String directly to `ClientConfig::new()`
+
+## v0.4.2
+- client connection handlers. `ClientExt::closed()` and `ClientExt::connected()`
+
+## v0.4.1
+- add `Client::close()` method
+- add benchmarks
+- use biased non-random `tokio::select`
+
+## v0.4.0 BREAKING
+- add `alive()` to check if connection is alive.
+- add `counter-server` example
+- more friendly panic messages
+- make `Server::call`, `Session::text`, `Session::binary` and `Session::call` synchronous
+
+## v0.3.0 BREAKING
+- Automatic GitHub workflows
+- Integration tests
+- Add `tungstenite::run_on` for alternative setups
+- Refactor the `Client<T>` `T` generic logic
+
+## v0.2.0 BREAKING
+- fix panics
+- close connection on heartbeat failure
+- improve reconnection mechanism
+- add basic authorization
+- rename `Client::message()` to `Client::call()`
+- `Client::call()` returns `Result<T, E>`
+- To/From Sender conversions on Client
+- Custom calls on `Session`
+- Add `Args` for session creation
+- Add `call_with` for with-response call
+- improve logging
+- remove `thiserror` usage
+
+https://github.com/gbaranski/ezsockets/compare/v0.1.0...v0.2.0
+
+## v0.1.0
+
+First release!