Add CHANGELOG

Author: bessman

CHANGELOG.md

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+# Changelog
+
+## [3.1.1] - 2025-01-05
+
+### Changed
+
+- Raise `RuntimeError` if `_I2CPrimitive._start` is called on an already active peripheral ([`d86fbfa`](https://github.com/fossasia/pslab-python/commit/d86fbfa324b6671926a8548340221b40228c782c)) (Alexander Bessman)
+
+### Fixed
+
+- Fix I2C bus becomes unusable after device scan ([`05c135d`](https://github.com/fossasia/pslab-python/commit/05c135d8c59b5075a1d36e3af256022f5759a3a5)) (Alexander Bessman)
+
+## [3.1.0] - 2024-12-28
+
+_Changelog added in following release._
+
+[3.1.1]: https://github.com/fossasia/pslab-python/releases/tag/3.1.1
+[3.1.0]: https://github.com/fossasia/pslab-python/releases/tag/3.1.0