Update CHANGELOG

CHANGELOG.md

@@ -10,6 +10,8 @@ v4.3.2
 - Print error message for invalid equation also in release version (!634)
 - HistoryPoints filter now uses closest plane to requested z-coordinate and
   output is produced in physical space (!621).
+- Fix minor performance issue with time integration schemes (!632)
+- Fix FilterCheckpoint filter to be consistent with `IO_CheckSteps` (!633)
 
 **FieldConvert**:
 - Fix appearence of duplicate messages when running in parallel (!626)