[R/loadWorkbook] remove isUnzipped option. closes #121

[JanMarvin]

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[JanMarvin]

Codecov Report

Merging #122 (74dff10) into main (1eb26f2) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #122   +/-   ##
=======================================
  Coverage   59.30%   59.31%           
=======================================
  Files          39       39           
  Lines        7306     7302    -4     
=======================================
- Hits         4333     4331    -2     
+ Misses       2973     2971    -2     

Impacted Files	Coverage Δ
R/loadWorkbook.R	85.38% <100.00%> (+0.25%)	⬆️

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