title: Prestashop child theme error
body: <p>I have troubles creating child-theme for paid theme (it's arena2). I've created new folder </p>
  
  <p>arena2-child
  - Config
  -- theme.yml
  preview.png</p>
  
  <p>Then I zip it and try to upload it to my prestaShop and I get error: "Incorrect config file".</p>
  
  <p>My theme.yml:</p>
  
  <p>name: arena2-child
  parent: arena2
  display_name: arena2-child</p>
  
  <p>assets:
  use_parent_assets: true</p>
  
  <p>parent folder is called "arena2"</p>