Update changelog for v1.1.0

Author: hugoledoux

changelog.md

@@ -8,7 +8,7 @@ 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).
 
 
-## Unreleased - coming in v1.1
+## [1.1.0] - 2021-12-01
 - add support for CityGML v3.0.0: 
   - add interior of Buildings/Tunnels/Bridges classes, eg `BuildingStorey`, `BuildingUnit`, `BuildingRoom`, `BridgeRoom` 
   - add `OtherConstruction`
@@ -125,6 +125,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - first beta release of CityJSON
 
 
+[1.1.0]: https://github.com/tudelft3d/cityjson/compare/1.0.3...1.1.0
 [1.0.3]: https://github.com/tudelft3d/cityjson/compare/1.0.2...1.0.3
 [1.0.2]: https://github.com/tudelft3d/cityjson/compare/1.0.1...1.0.2
 [1.0.0]: https://github.com/tudelft3d/cityjson/compare/0.9...1.0.0