Update changelog

Author: jcs090218

CHANGELOG.md

@@ -5,12 +5,18 @@ All notable changes to this project will be documented in this file.
 Check [Keep a Changelog](http://keepachangelog.com/) for recommendations on how to structure this file.
 
 
-## 0.5.1 (Unreleased)
+## 0.5.2 (Unreleased)
 > Released N/A
 
+* N/A
+
+## 0.5.1
+> Released Feb 4, 2022
+
 * Limit feature undone changes to only valid buffer, unlike `*scratch*` buffer.
 * Added thumbnail support on the opposing fringe.
 * Use `hash-table` instead of list to improve performance.
+* Fix issue when max line cache is `nil` on save. (cd60583a6d040a9874d273d2d66fe397664ed54d)
 
 ## 0.5.0
 > Released May 28, 2021