Fix CS

Author: ondrejmirtes

changelog-generator/run.php

@@ -19,7 +19,6 @@
 use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Output\OutputInterface;
 use function array_map;
-use function array_merge;
 use function count;
 use function escapeshellarg;
 use function exec;