[Semantic Versioning]: http://semver.org/
## Unreleased
+
+## 0.4.1 - 2019-03-15
+### Fixed
+- Some playground file.
+
+## 0.4.0 - 2019-03-15
+### Added
+- Jiri's updates (some files in playground changed).
+
+## 0.3.1 - 2018-10-16
### Fixed
- Branching part.