configure towncrier template

CHANGES/template.jinja

@@ -0,0 +1,31 @@
+{% for section, _ in sections.items() %}
+{% set underline = underlines[0] %}{% if section %}{{section}}
+{{ underline * section|length }}{% set underline = underlines[1] %}
+{% endif %}
+{% if sections[section] %}
+{% for category, val in definitions.items() if category in sections[section]%}
+{{ definitions[category]['name'] }}
+{{ underline * definitions[category]['name']|length }}
+
+{% if definitions[category]['showcontent'] %}
+{% for text, values in sections[section][category].items() %}
+- {{ text }}
+  (see {{ values|join(',\n  ') }});
+{% endfor %}
+
+{% else %}
+- {{ sections[section][category]['']|join(',\n  ') }};
+
+{% endif %}
+{% if sections[section][category]|length == 0 %}
+No significant changes.
+
+{% else %}
+{% endif %}
+{% endfor %}
+{% else %}
+No significant changes.
+
+
+{% endif %}
+{% endfor %}

pyproject.toml

@@ -5,3 +5,6 @@ filename = "CHANGES.txt"
 title_format = "{version} ({project_date})"
 
 underlines = [ '^', '~', '"' ]
+
+issue_format = "`#{issue} <https://github.com/aio-libs/aioredis/issues/{issue}>`_"
+template = "CHANGES/template.jinja"