Warn contributors: README is generated (#919)

Co-authored-by: Andreas Möller <am@localheinz.com>

Author: szepeviktor

.dev-tools/src/Readme/ReadmeCommand.php

@@ -44,7 +44,8 @@ final class ReadmeCommand extends Command
  protected function execute(InputInterface $input, OutputInterface $output): int
  {
  $output->write(
- \sprintf('# %s', self::NAME) . "\n\n"
+ "<!-- This file is generated by ReadmeCommand -->\n\n"
+ . \sprintf('# %s', self::NAME) . "\n\n"
  . $this->badges() . "\n\n"
  . $this->description() . "\n\n"
  . $this->installation() . "\n\n"

README.md

@@ -1,3 +1,5 @@
+<!-- This file is generated by ReadmeCommand -->
+
 # PHP CS Fixer: custom fixers
 
 [![Latest stable version](https://img.shields.io/packagist/v/kubawerlos/php-cs-fixer-custom-fixers.svg?label=current%20version)](https://packagist.org/packages/kubawerlos/php-cs-fixer-custom-fixers)