update changelog with link to old repo

Author: LeonieFierz

CHANGELOG.md

@@ -10,13 +10,11 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 
 - All commands according to data sheet
-## [0.1.0] - 2021-2-1
 
-### Added
+### Deprecated
+
+- Deprecated the previous Python SCD4x driver repository https://github.com/Sensirion/python-i2c-scd
 
-- Initial version
-- Check latest 0.x.x version for changelog prior to version 1.0.0
 
 [Unreleased]: https://github.com/Sensirion/python-i2c-scd4x/compare/1.0.0...HEAD
-[1.0.0]: https://github.com/Sensirion/python-i2c-scd4x/compare/0.1.0...1.0.0
-[0.1.0]: https://github.com/Sensirion/python-i2c-scd4x/releases/tag/0.1.0
+[1.0.0]: https://github.com/Sensirion/python-i2c-scd4x/releases/tag/1.0.0