mapexpr wasn't introduced till 1.5

[rofinn]

No description provided.

[codecov]

Codecov Report

Merging #155 (2b477ed) into master (0eb6a7a) will decrease coverage by 1.62%.
The diff coverage is 100.00%.

❗ Current head 2b477ed differs from pull request most recent head 27b2469. Consider uploading reports for the commit 27b2469 to get more accurate results

@@            Coverage Diff             @@
##           master     #155      +/-   ##
==========================================
- Coverage   91.91%   90.29%   -1.63%     
==========================================
  Files          12       12              
  Lines        1212     1205       -7     
==========================================
- Hits         1114     1088      -26     
- Misses         98      117      +19     

Impacted Files	Coverage Δ
src/FilePathsBase.jl	100.00% <ø> (ø)
src/system.jl	93.10% <100.00%> (+0.63%)	⬆️
src/windows.jl	53.84% <0.00%> (-35.90%)	⬇️
src/libc.jl	53.19% <0.00%> (-14.16%)	⬇️
src/path.jl	87.78% <0.00%> (-0.12%)	⬇️

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