Added missing changelog entries.

Author: IanLee1521

CHANGES.txt

@@ -15,7 +15,9 @@ Changes:
 * Reverted the fix in #368, "options passed on command line are only ones
   accepted" feature. This has many unintended consequences in pep8 and flake8
   and needs to be reworked when I have more time.
-* Added support for Python 3.5. (Issue #420)
+* Added support for Python 3.5. (Issue #420 & #459)
+* Added support for multi-line config_file option parsing. (Issue #429)
+* Improved parameter parsing. (Issues #420 & #456)
 
 Bugs: