Init Changelog

Author: felixhekhorn

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/).
+
+This project does NOT adhere strictly to [Semantic Versioning](https://semver.org/spec/v2.0.0.html), since we consider database changes non-breaking.
+
+## [Unreleased](https://github.com/NNPDF/banana/compare/v0.6.16...HEAD)
+
+### Added
+- Add `PTO_matching` field, with default `None`
+
+### Changed
+- Drop py3.9 tests and add py3.14 ones instead