Add changelog for backend

content/4.backend/3.changelog.md

@@ -2,6 +2,12 @@
 title: 'Changelog'
 ---
 
+# Version 1.3.1
+
+ - Fixed bug where "false" env variables weren't treated as false for booleans
+ - Added ARM support for hosted docker container
+ - Stopped using JSON for recaptcha verifications.
+
 # Version 1.3.0
 
 For this update, you will need to run migrations.