Add missing empty lines to changelog btw releases

Author: hynek

CHANGELOG.md

@@ -20,6 +20,7 @@ See https://github.com/python-attrs/attrs/blob/main/.github/CONTRIBUTING.md#chan
 
 <!-- towncrier release notes start -->
 
+
 ## [23.2.0](https://github.com/python-attrs/attrs/tree/23.2.0) - 2023-12-31
 
 ### Changes
@@ -42,6 +43,7 @@ See https://github.com/python-attrs/attrs/blob/main/.github/CONTRIBUTING.md#chan
   It is, for example, now possible to attach methods.
   [#1203](https://github.com/python-attrs/attrs/issues/1203)
 
+
 ## [23.1.0](https://github.com/python-attrs/attrs/tree/23.1.0) - 2023-04-16
 
 ### Backwards-incompatible Changes

changelog.d/towncrier_template.md.jinja

@@ -25,4 +25,5 @@ No significant changes.
 
 
 {% endif %}
+
 {% endfor %}