* add trailing newline after <pre>

lib/Text/Dokuwiki/Render/Markdown.pm

@@ -101,7 +101,7 @@ sub pre {
 
   my @lines = map { "  " . $_ } split(/\r?\n/o, $content);
 
-  return join("\n", @lines);
+  return join("\n", @lines) . "\n\n";
 }
 
 sub codeblock {