Forgot a newline in HTML generator.

src/generators/html.cpp

@@ -118,7 +118,7 @@ void write_html(ostream &out, const vector<entry_type> &entries)
                 out << "        <li><a href=\"" << screenshot << "\">"
                     << screenshot << "</a></li>\n";
             }
-            out << "      </ul>";
+            out << "      </ul>\n";
         }
         out << "    </details>\n";
     }