Prepare for 5.3.1 release

Author: gmfeinberg

CHANGELOG.md

@@ -2,7 +2,7 @@
 All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/).
 
-## [5.3.0] 2022-02-17
+## [5.3.1] 2022-02-17
 
 See also sections on 5.2.30 and 5.2.31 as they were not released publicly. The last public release was 5.2.29.