Update CHANGELOG

CHANGELOG.md

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-# Changelog
-
-## v1.0 - 2022-06-30
-
-### Added
-- Initial Release
+# Changelog
+
+## v2.0 - 2023-05-25
+
+Some rework to package to more easier load .pem-certificates instead of the .p12-variant.
+
+This is a breaking update, however – migrating from v1.0 should take five minutes or less in most cases. Please [review the upgrade guide](https://github.com/olssonm/swish-php/blob/main/UPGRADE.md) for changes.
+
+Support for PHP 7.4 and 8.0 has been dropped.
+
+### What's Changed
+
+- Downgrade to ubuntu 20.04 by @olssonm in https://github.com/olssonm/swish-php/pull/1
+- Fix broken build-shield by @olssonm in https://github.com/olssonm/swish-php/pull/2
+- Add php 8.2 to the test matrix by @olssonm in https://github.com/olssonm/swish-php/pull/3
+- Improve handling of .pem-certificates by @olssonm in https://github.com/olssonm/swish-php/pull/4
+
+### New Contributors
+
+**Full Changelog**: https://github.com/olssonm/swish-php/compare/v1.0...v2.0
+
+## v1.0 - 2022-06-30
+
+### Added
+
+- Initial Release