Update changelog for v22.4.0.

CHANGES.md

@@ -1,6 +1,9 @@
 ## Summary of release changes, see commit history for more details:
 ## https://github.com/joelthelion/autojump/commits/master/
 
+### Release v22.4.0:
+- minor zsh performance improvement
+
 ### Release v22.3.0:
 - use colors only if stdout is a terminal
 - updated RedHat docs