updated CHANGELOG and version number

CHANGELOG.md

 # Changelog
 All notable changes to this project will be documented in this file.
 
+## v1.2.1 -  2021-02-08  - bug fix for recursive import error
+
+### general:
+
+* applied bug fix
+
+### technical:
+
+* bug fix for recursive import error, #269
+
 ## v1.2.0 -  2020-12-18  - parallel preprocessing and improved data handlers
 
 ### general:

mlair/__init__.py

 __version_info__ = {
     'major': 1,
     'minor': 2,
-    'micro': 0,
+    'micro': 1,
 }
 
 from mlair.run_modules import RunEnvironment, ExperimentSetup, PreProcessing, ModelSetup, Training, PostProcessing