Added towncrier and clone changelog from GitHub Releases page

CHANGES/.template.rst.jinja2

@@ -0,0 +1,44 @@
+{% if top_line %}
+{{ top_line }}
+{{ top_underline * ((top_line)|length)}}
+{% elif versiondata.name %}
+{{ versiondata.version }} ({{ versiondata.date }})
+{{ top_underline * ((versiondata.version + versiondata.date)|length + 4)}}
+{% else %}
+{{ versiondata.version }} ({{ versiondata.date }})
+{{ top_underline * ((versiondata.version + versiondata.date)|length + 3)}}
+{% endif %}
+{% 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 }}
+  {{ values|join(', ') }}
+{% endfor %}
+
+{% else %}
+- {{ sections[section][category]['']|join(', ') }}
+
+{% endif %}
+{% if sections[section][category]|length == 0 %}
+No significant changes.
+
+{% else %}
+{% endif %}
+
+{% endfor %}
+{% else %}
+No significant changes.
+
+
+{% endif %}
+{% endfor %}