Remove some trailing whitespace

[rymdbar]

Here's another diff from almost half a year ago. It was originally on top of #70, but that one didn't get merged during the past week. Since this appears to have rebased without conflicts, feel free to consider them independently of each other.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 87.61%. Comparing base (5608387) to head (ed9ca4a).

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #71   +/-   ##
=======================================
  Coverage   87.61%   87.61%           
=======================================
  Files          11       11           
  Lines         105      105           
=======================================
  Hits           92       92           
  Misses         13       13           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.