Testing on 32-bit

[rofinn]

Closes #80

[codecov]

Codecov Report

Merging #83 into master will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #83   +/-   ##
=======================================
  Coverage   97.56%   97.56%           
=======================================
  Files           6        6           
  Lines         205      205           
=======================================
  Hits          200      200           
  Misses          5        5           

Impacted Files	Coverage Δ
src/file_io.jl	94.33% <100.00%> (ø)

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