MSVC: suppress warning 4146

[matbech]

suppress this warning warning C4146: unary minus operator applied to unsigned type, result still unsigned

[codecov[bot]]

Codecov Report

Merging #64 (442c2d2) into master (72a4bab) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #64   +/-   ##
=======================================
  Coverage   85.10%   85.10%           
=======================================
  Files          44       44           
  Lines        3960     3960           
=======================================
  Hits         3370     3370           
  Misses        590      590           

Impacted Files	Coverage Δ
src/reader_int.cpp	90.83% <ø> (ø)

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[eliaskosunen]

Looks good, merged!