Add changelog (#37)

Author: brettimus

CHANGELOG.md

@@ -0,0 +1,61 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
+
+<!-- This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html). -->
+
+---
+
+## [Unreleased]
+
+### Added
+
+- OpenTelemetry Support (#28)
+- Fly.io example (#26)
+- Django example (#22)
+
+### Changed
+
+-
+
+### Deprecated
+-
+
+### Removed
+
+- 
+
+### Fixed
+
+- The `autometrics` decorator now supports async functions (#33)
+
+### Security
+
+-
+
+---
+
+## [0.4](https://github.com/autometrics-dev/autometrics-py/releases/tag/0.4) - 2023-04-13
+
+### Added
+
+- SLO Support (#16)
+- Improved documentation and examples (#13 #19)
+
+### Changed
+
+- Development setup (#10 #12)
+
+### Fixed
+
+- Issue with trailing slashes in prometheus url (#14)
+
+
+## [0.3](https://github.com/autometrics-dev/autometrics-py/releases/tag/0.3) - 2023-03-28
+
+### Added
+
+- Implemented caller label for the function calls counter (#9)
+