Add CHANGELOG (#37)

CHANGELOG.md

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+# 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/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## v0.1.1 - 2025-01-22
+
+### Fixed
+- Fix a bug where panicked tests weren't marked as failed synchronously
+  causing callers to see a panicked test as successful.
+
+## v0.1.0 - 2025-01-13
+
+Initial release of faket.
+
+See [README](https://github.com/bracesdev/errtrace#readme)
+for more information.