docs: update towncrier template

tools/towncrier.template.md

@@ -1,15 +1,13 @@
-
-## [{{ versiondata.version }}] ({{versiondata.date}})
 {% for section, _ in sections.items() %}
 {% if section %}{{section}}{% endif -%}
 {% if sections[section] %}
 {% for category, val in definitions.items() if category in sections[section] %}
-
 ### {{ definitions[category]['name'] }}
 {% if definitions[category]['showcontent'] %}
 {% for text, values in sections[section][category].items() %}
-- {{ text }}  {{ values|reject("eq", "[#noissue]")|join(', ') }}
+- {{ text }}{% if values %}  {{ values|join(', ') }}{% endif +%}
 {% endfor %}
+
 {% endif %}
 {% endfor %}
 {% endif %}