fix changelog year for 1.11.0
# CHANGELOG for django-crispy-forms
-## 1.11.0 (2020-01-30)
+## 1.11.0 (2021-01-30)
* Implemeneted `custom-select` for Select widgets in the Bootstrap4 Template Pack (#1091)
* Fixed `data-parent` in AccodrianGroup (#1091)
* Documentation improvements
