Update Changelog

Author: tsantor

CHANGELOG.md

@@ -3,6 +3,10 @@ All enhancements and patches to Cookiecutter Django will be documented in this f
 
 <!-- GENERATOR_PLACEHOLDER -->
 
+## [2021-12-27]
+### Changed
+- Hides &#39;sign up&#39; elements when ACCOUNT_ALLOW_REGISTRATION is disabled ([#1914](https://github.com/cookiecutter/cookiecutter-django/pull/1914))
+
 ## [2021-12-26]
 ### Fixed
 - Fix missing psycopg2 dependency in docs Docker image ([#3494](https://github.com/cookiecutter/cookiecutter-django/pull/3494))