add changelog

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/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [1.0.1] - 2024-06-27
+
+### Changed
+
+- Rates now have up to 8 decimal positions of precision, up from the previous 0, 2 or 3 depending on the currency.
+- Internally, `xexe` now uses an in-house `MoneyAmount` class as a replacement of `py-money`'s `Money` class.
+- The table schema when writing to Postgresql has gone from `DECIMAL(19,4)` to `DECIMAL(23,8)` to adapt accordingly.
+- `CHF` has been added to the default currencies included in the `run_xexe.sh` deployment script.