File _service of Package polychromatic

<services>
  <service name="download_url">
    <param name="protocol">https</param>
    <param name="host">github.com</param>
    <param name="path">/polychromatic/polychromatic/archive/v0.8.6.tar.gz</param>
  </service>
  <service name="verify_file">
    <param name="file">_service:download_url:v0.8.6.tar.gz</param>
    <param name="verifier">sha256</param>
    <param name="checksum">b9bcdfbd56aa03321d2275433573e16d991b38c47c647ff70e4a011a3b985066</param>
  </service>
</services>