Update CHANGELOG.md

Author: peanutfun

CHANGELOG.md

@@ -296,7 +296,6 @@ Removed:
 
 ### Added
 
-- `climada.util.calibrate` module for calibrating impact functions [#692](https://github.com/CLIMADA-project/climada_python/pull/692)
 - Convenience method `api_client.Client.get_dataset_file`, combining `get_dataset_info` and `download_dataset`, returning a single file objet. [#821](https://github.com/CLIMADA-project/climada_python/pull/821)
 - Read and Write methods to and from csv files for the `DiscRates` class. [#818](https://github.com/CLIMADA-project/climada_python/pull/818)
 - Add `CalcDeltaClimate` to unsequa module to allow uncertainty and sensitivity analysis of impact change calculations [#844](https://github.com/CLIMADA-project/climada_python/pull/844)