chore: update changelog

CHANGELOG.md

@@ -7,6 +7,13 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+## [0.8.1] - 2024-09-11
+
+### Fixed
+
+* Use a context manager for opening files in https://github.com/CQCL/pytket-phir/pull/219
+* Emit nested binary expressions for classical ops in https://github.com/CQCL/pytket-phir/pull/224
+
 ## [0.8.0] - 2024-07-16
 
 ### Added
@@ -215,6 +222,7 @@ First release.
 [0.7.2]: https://github.com/CQCL/pytket-phir/compare/v0.7.1...v0.7.2
 [0.7.3]: https://github.com/CQCL/pytket-phir/compare/v0.7.2...v0.7.3
 [0.8.0]: https://github.com/CQCL/pytket-phir/compare/v0.7.3...v0.8.0
-[unreleased]: https://github.com/CQCL/pytket-phir/compare/v0.8.0...HEAD
+[0.8.1]: https://github.com/CQCL/pytket-phir/compare/v0.8.0...v0.8.1
+[unreleased]: https://github.com/CQCL/pytket-phir/compare/v0.8.1...HEAD
 
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