title: Symfony Form multiple range field
body: <p>I need to make a search form where I need a range slider so a user could choose price_from and price_to. <a href="https://jqueryui.com/slider/#range" rel="nofollow noreferrer">Something like this</a> 
  What is the best way to implement it?
  The only I have found is <a href="http://symfony.com/doc/2.8/reference/forms/types/range.html" rel="nofollow noreferrer">range type field</a>
  It is pretty close to what I need, but it has only one value while I need two values (price_from and price_to)</p>