Update changelog

CHANGELOG.md

@@ -0,0 +1,36 @@
+# 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/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+
+## [1.0.1](https://github.com/netgrif/petriflow/releases/tag/v1.0.1) (2021-12-07)
+
+### Added
+- [PF-15] Petriflow schema changes related to default and anonymous roles
+
+### Changed
+- [PF-4] XSD element to complex type
+
+## [1.0.0](https://github.com/netgrif/petriflow/releases/tag/v1.0.0) (2021-08-05)
+
+First public release of the project.
+
+Full Changelog: [https://github.com/netgrif/petriflow/commits/v1.0.0](https://github.com/netgrif/petriflow/commits/v1.0.0)
+
+
+[comment]: <> (Template)
+[comment]: <> (## [version]&#40;https://github.com/netgrif/petriflow.js/releases/tag/v&#41; - date)
+[comment]: <> (### Added )
+[comment]: <> (for new features.)
+[comment]: <> (### Changed )
+[comment]: <> (for changes in existing functionality.)
+[comment]: <> (### Deprecated )
+[comment]: <> (for soon-to-be removed features.)
+[comment]: <> (### Removed )
+[comment]: <> (for now removed features.)
+[comment]: <> (### Fixed )
+[comment]: <> (for any bug fixes.)
+[comment]: <> (### Security)
+[comment]: <> (in case of vulnerabilities.)