Add header for contributors section

Author: OptimumCode

changelog_config.json

@@ -36,7 +36,7 @@
     "order": "ASC",
     "on_property": "mergedAt"
   },
-  "template": "#{{CHANGELOG}}\n\n<details>\n<summary>Uncategorized</summary>\n\n#{{UNCATEGORIZED}}\n</details>\n\n<details>\n<summary>Also merged but not included in notes</summary>\n\n#{{IGNORED}}\n</details>\n\n#{{CONTRIBUTORS}}\n\n#{{RELEASE_DIFF}}",
+  "template": "#{{CHANGELOG}}\n\n<details>\n<summary>Uncategorized</summary>\n\n#{{UNCATEGORIZED}}\n</details>\n\n<details>\n<summary>Also merged but not included in notes</summary>\n\n#{{IGNORED}}\n</details>\n\n### Contributors\n\n#{{CONTRIBUTORS}}\n\n#{{RELEASE_DIFF}}",
   "pr_template": "- #{{TITLE}} (PR: ##{{NUMBER}})",
   "empty_template": "Nothing here today",
   "trim_values": true,