Fixes to pass CRAN checks

[pepijn-devries]

No description provided.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 60.93%. Comparing base (1ba1493) to head (fc29793).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master       #7   +/-   ##
=======================================
  Coverage   60.93%   60.93%           
=======================================
  Files          10       10           
  Lines        3609     3609           
=======================================
  Hits         2199     2199           
  Misses       1410     1410           

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