Add PR link to the changelog line item

changelog/_template.md.j2

@@ -4,7 +4,7 @@
 ### {{ definitions[category]['name'] }}
 
 {% for text, values in sections[section][category].items() %}
-{{ text }}
+{{ text }} ({{ values|join(', ') }})
 
 {% endfor %}
 {% endfor %}

pyproject.toml

@@ -217,6 +217,7 @@ directory = "changelog"
 start_string = "<!-- towncrier release notes start -->\n"
 template = "changelog/_template.md.j2"
 title_format = "## [{version}] - {project_date}"
+issue_format = "[#{issue}](https://github.com/pipecat-ai/pipecat/pull/{issue})"
 underlines = ["", "", ""]
 wrap = true