Update change log

Author: colinpalmer

CHANGELOG.txt

@@ -5,9 +5,13 @@ Version 1.4.1 (2022-07-12)
 --------------------------
 
 * Add file names to mrcfile-header output
-* Add file names and a success message for valid files to the output of the
-  validation functions (mrcfile-validate command and the mrcfile.validate()
-  function)
+* Improvements to validation functions (mrcfile-validate command and the
+  mrcfile.validate() function):
+  * Add a message with the file name of each file processed, to enable valid
+    and invalid files to be identified.
+  * Add a message confirming that valid files are valid.
+  * Ensure that all files are processed when validating multiple files, even
+    if some are invalid or raise exceptions on opening.
 * Add support for numpy 1.23 and Python 3.10 and 3.11
 
 Version 1.4.0 (2022-07-02)