File _link of Package python-grequests

<link project="openSUSE:Leap:15.2" package="python-grequests" baserev="85335d96e5fb2f66c20665af57c2138b">
  <patches>
    <delete name="LICENSE"/>
    <delete name="grequests-0.2.0.tar.gz"/>
    <apply name="project.diff"/>
  </patches>
</link>