fix right apastrophe issue

[lorenzwalthert]

Closes #489.

[codecov-io]

Codecov Report

Merging #490 into master will decrease coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #490      +/-   ##
==========================================
- Coverage   89.69%   89.63%   -0.07%     
==========================================
  Files          36       36              
  Lines        1650     1650              
==========================================
- Hits         1480     1479       -1     
- Misses        170      171       +1

Impacted Files	Coverage Δ
R/utils.R	66.66% <0%> (-2.78%)	⬇️

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