Fix --stats output rendering

apachedex/__init__.py

@@ -1204,7 +1204,7 @@ def asHTML(
           ('Rendering time', timedelta(seconds=(
             end_stat_time - end_parsing_time))),
         ):
-      out.write('<tr><th class="text">{caption}</th><td>{value}</td></tr>')
+      out.write(f'<tr><th class="text">{caption}</th><td>{value}</td></tr>')
     out.write('</table>')
   out.write('</body></html>')