fix: extend regex in read.xlsx to allow .xlsm files; solves #209

[dseynaev]

solves #209

[JanMarvin]

also #205

[codecov-commenter]

Codecov Report

Merging #210 (ccc5ed3) into master (c918852) will not change coverage.
The diff coverage is 50.00%.

@@           Coverage Diff           @@
##           master     #210   +/-   ##
=======================================
  Coverage   65.44%   65.44%           
=======================================
  Files          34       34           
  Lines        8879     8879           
=======================================
  Hits         5811     5811           
  Misses       3068     3068           

Impacted Files	Coverage Δ
R/readWorkbook.R	87.68% <50.00%> (ø)

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