title: Codecov: error processing coverage reports
body: <p>I want to add codecov to <a href="https://github.com/HumanCapitalAnalysis/thesis-projects-tostenzel/tree/ec7f874a2663bdad5a126bb028194c2b562e1868" rel="nofollow noreferrer">this project</a>. Yet, codecov says <a href="https://codecov.io/gh/HumanCapitalAnalysis/thesis-projects-tostenzel/commit/ec7f874a2663bdad5a126bb028194c2b562e1868" rel="nofollow noreferrer">here</a> that it can not process my coverage.xml file that I created with this command: <code>pytest python/tests -v --junitxml=coverage.xml</code> in the Travis CI script. </p>
  
  <p>Everything prior to that like providing my token seems to work as suggested in the TravisCI build <a href="https://travis-ci.org/HumanCapitalAnalysis/thesis-projects-tostenzel/jobs/642690377" rel="nofollow noreferrer">here</a>.</p>
  
  <p>I thought this could perhaps be a problem with the paths but I included a potential fix in the <code>codecov.yml</code> and nothing changed.</p>
  
  <p>Therefore, I do not think that the script <code>codecov.yml</code>, <code>travis.yml</code>, and <code>utils/travis_runner.py</code> are part of the problem.</p>