title: Not quoting a scalar starting with the "%" indicator character is deprecated since Symfony 3.1
body: <p>All my services and parameters from <strong>services.yml</strong> are striked and I get the message <strong>"Not quoting a scalar starting with the "%" indicator character is deprecated since Symfony 3.1"</strong>.
  But I am using <strong>Symfony 2.6</strong> and I don't want to put the values in quotes since it is not needed for this version. This happened only after I updated my Symfony Plugin for PhpStorm 2016.1</p>
  
  <p>What can I do to avoid this? (using PhpStorm 10 or using an older plugin is not an option)      </p>