added feature returnValue for saveWorkbokk #71

[ycphs]

I added a new feature to the function.

It would be great, if you (@rmanfredi) could check. Is that what you had in mind?

[codecov]

Codecov Report

Merging #93 into master will increase coverage by 0.50%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #93      +/-   ##
==========================================
+ Coverage   58.72%   59.23%   +0.50%     
==========================================
  Files          30       30              
  Lines        8696     8630      -66     
==========================================
+ Hits         5107     5112       +5     
+ Misses       3589     3518      -71     

Impacted Files	Coverage Δ
R/wrappers.R	46.64% <ø> (+0.18%)	⬆️
R/conditional_formatting.R	0.00% <0.00%> (ø)
R/WorkbookClass.R	50.99% <0.00%> (+0.67%)	⬆️

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