title: Should I keep symfony.lock in my version control?
body: <p>I'm starting to use Symfony Flex to bootstrap my project and I realized that running <code>composer install</code> for the first time generates a file named <code>symfony.lock</code> for which I could find no documentation.</p>
  
  <p>What does this file do? Should I keep it in my version control and deploy it or should I .gitignore it?</p>