Release 3.0 in CHANGELOG.md

Author: sebastian-peter

CHANGELOG.md

@@ -6,6 +6,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased/Snapshot]
 
+## [3.0.0] - 2023-01-30
+
 ### Added
 - SQL time series sources (`SqlTimeSeriesSource` and `SqlTimeSeriesMappingSource`) [#467](https://github.com/ie3-institute/PowerSystemDataModel/issues/467)
 - SQL time series have a different structure than CSV counterparts [#545](https://github.com/ie3-institute/PowerSystemDataModel/issues/545)
@@ -190,7 +192,8 @@ coordinates or multiple exactly equal coordinates possible
 -   CsvDataSource now stops trying to get an operator for empty operator uuid field in entities
 -   CsvDataSource now parsing multiple geoJson strings correctly
 
-[Unreleased/Snapshot]: https://github.com/ie3-institute/powersystemdatamodel/compare/2.1.0...HEAD
+[Unreleased/Snapshot]: https://github.com/ie3-institute/powersystemdatamodel/compare/3.0.0...HEAD
+[3.0.0]: https://github.com/ie3-institute/powersystemdatamodel/compare/2.1.0...3.0.0
 [2.1.0]: https://github.com/ie3-institute/powersystemdatamodel/compare/2.0.1...2.1.0
 [2.0.1]: https://github.com/ie3-institute/powersystemdatamodel/compare/2.0.0...2.0.1
 [2.0.0]: https://github.com/ie3-institute/powersystemdatamodel/compare/1.1.0...2.0.0