Apply suggestion from @Copilot

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Signed-off-by: Zack Koppert <zkoppert@github.com>

Author: zkoppert

markdown_writer.py

@@ -254,6 +254,7 @@ def write_to_markdown(
                     file.write(f" {issue.pr_comment_count or 'N/A'} |")
                 file.write("\n")
             file.write("\n")
+        file.write("\n")
         file.write(
             "_This report was generated with the \
 [Issue Metrics Action](https://github.com/github/issue-metrics)_\n"