Add date to changelog

Author: supercam19

changlelog.md

@@ -1,6 +1,6 @@
 # SMAPI Profile Manager Changelog
 
-## Update [v1.2.4] (???)
+## Update [v1.2.4] (Feb 9, 2023)
 A slightly more feature heavy update than recently, possibly the last big update until 1.3.0.
 
 ### Additions
@@ -11,6 +11,7 @@ A slightly more feature heavy update than recently, possibly the last big update
 ### Changes
  - Massively reorganized the code to make it easier to work with
  - Colour improvements to the profile editor
+ - Updated the preview in the README
 
 ### Fixes
  - Fixed alignment issues in the profile editor