update Changelog

CHANGELOG

+<<<<<<< HEAD
 21.08.2018:
 update downloadversionIRdata:
 	- include version number, now 2.5.3 into the files
 	- bug fixes for downloadversion IRdata
 	- improvement of exception handling, replace some exception with warnings and improve error messages
 
+=======
+01.08.2017:
+changes in downloadversionIRdata:
+    - OP1.2b version now online for upload and download of the IRdata
+>>>>>>> 868a427421003a9ced34cbbf3c17eadf42312057
 03.11.2017:
 changes in downloadversionIRdata:
     - reduce blocks to 1 second, now editable over parameter intervalSize