updated changelog

CHANGELOG.md

 # Changelog
 All notable changes to this project will be documented in this file.
 
+## v1.3.0 -  2021-02-24  - competitors and improved transformation
+
+### general:
+* release of official MLAir logo (#274)
+* new transformation schema for better independence of MLAir and data handler (#272)
+* competing models can be included in postprocessing for direct comparison (#198)
+
+### new features:
+* new helper functions for geographic issues (#280)
+* default data handler and inheritances can use min/max and log transformation (#276, #275)
+* include IntelliO3-ts model as reference via automatic download (#131)
+
+### technical:
+* experiment name now always includes target sampling type (#263)
+* competitive skill score plot is refactored (#260)
+* bug fix for climatological skill scores (#259)
+* bug fix for custom objects handling (#277)
+* bug fix for monitoring plots when multiple output branches are used (#278)
+* update requirements to newer version and dependencies (#262, #273)
+* HPC scripts are updated to work properly with parallel data processing (#281)
+
 ## v1.2.1 -  2021-02-08  - bug fix for recursive import error
 
 ### general:
@@ -9,7 +30,7 @@ All notable changes to this project will be documented in this file.
 
 ### technical:
 
-* bug fix for recursive import error, #269
+* bug fix for recursive import error, (#269)
 
 ## v1.2.0 -  2020-12-18  - parallel preprocessing and improved data handlers