Add CHANGELOG.md

CHANGELOG.md

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+## MewssageBus changelog
+
+### 0.6.5
+#### new features:
+* the `Message` trait no more required to be `Clone`
+* added methods `send_one`, `send_one_blocked`, `try_send_one` which does not require `Message: Clone`
+
+### 0.6.4
+#### new features:
+* added struct `Module` and `BusBuilder::add_module` 
+
+### 0.6.3
+#### fixes:
+* Update Error Handling
+
+#### breaking changes:
+* all methods now return `messagenus::Error`
+
+### 0.6.2 
+#### new features:
+* add `request_we` for requests when we know the handler's error type 
+
+#### fixes:
+* Update Error Handling
+
+#### breaking changes:
+* send methods now return `messagenus::SendError`
+
+#### notes:
+* Got rid of `anyhow::Error`
+
+### 0.6.0 
+#### new features:
+* Request/Response API (request method)
+
+#### fixes:
+* Fix some unwaked receivers
+
+#### breaking changes:
+* Add `type Response` and `type Error` into all handlers
+
+#### notes:
+* Refactorin Receivers API