doc(CHGLOG): update changelog

CHANGELOG.md

@@ -9,8 +9,6 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 
-- **Polar** class
-
 ### Changed
 
 ### Deprecated
@@ -19,6 +17,24 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 
+## [4.0.0] 2022-06-09
+
+### Added
+
+- **Polar** class
+
+### Changed
+
+- **BREAKING**: All functions related to Polars now impose a Polar object as
+  input and no longer accept a structure
+- **BREAKING**: **xf2mat** now outputs a Polar object and not a structure
+- Updated tests to reflect changes
+- Big doc update
+
+### Removed
+
+- Duplicate tests
+
 ## [3.0.0] - 2022-06-06
 
 ### Changed
@@ -92,8 +108,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - Initial release
 
-[Unreleased]: https://gitlab.uliege.be/am-dept/matlab_airfoil_toolbox/-/compare/v3.0.0...master
-[3.0.1]: https://gitlab.uliege.be/am-dept/matlab_airfoil_toolbox/-/compare/v2.0.1...v3.0.0
+[Unreleased]: https://gitlab.uliege.be/am-dept/matlab_airfoil_toolbox/-/compare/v4.0.0...master
+[4.0.0]: https://gitlab.uliege.be/am-dept/matlab_airfoil_toolbox/-/compare/v3.0.0...v4.0.0
+[3.0.0]: https://gitlab.uliege.be/am-dept/matlab_airfoil_toolbox/-/compare/v2.0.1...v3.0.0
 [2.0.1]: https://gitlab.uliege.be/am-dept/matlab_airfoil_toolbox/-/compare/v2.0.0...v2.0.1
 [2.0.0]: https://gitlab.uliege.be/am-dept/matlab_airfoil_toolbox/-/compare/v1.2.0...v2.0.0
 [1.2.0]: https://gitlab.uliege.be/am-dept/matlab_airfoil_toolbox/-/compare/v1.1.0...v1.2.0