fix: remove an extra line in the changelog template

hg_autochangelog/templates/changelog.md

@@ -15,7 +15,7 @@
 {% for version, changes in changelog.changes_by_version.items() %}
 {%- if version.label == "upcoming" %}
 ## Upcoming version
-{% else %}
+{%- else %}
 ## Version {{ version.label }} ({{ version.release_date.strftime('%Y-%m-%d') }})
 {%- endif %}
 {{- new_section(changes, ChangeType.feat, "New features") }}