Workaround windows failure

[timholy]

For reasons not understood, Windows fails to download the test files
under Julia 1.0. It would be great if someone debugged this, but in the
meantime it seems best to work around the failure.

[timholy]

Example: https://github.com/JuliaIO/FileIO.jl/pull/348/checks?check_run_id=3542927418

[codecov]

Codecov Report

Merging #349 (96fd349) into master (ba94b81) will decrease coverage by 0.26%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #349      +/-   ##
==========================================
- Coverage   87.34%   87.07%   -0.27%     
==========================================
  Files          10       10              
  Lines         656      681      +25     
==========================================
+ Hits          573      593      +20     
- Misses         83       88       +5     

Impacted Files	Coverage Δ
src/error_handling.jl	77.27% <0.00%> (-2.73%)	⬇️
src/registry_setup.jl	95.76% <0.00%> (-0.64%)	⬇️
src/precompile.jl	0.00% <0.00%> (ø)
src/loadsave.jl	98.79% <0.00%> (+0.01%)	⬆️
src/deprecated.jl	47.91% <0.00%> (+0.09%)	⬆️
src/registry.jl	89.83% <0.00%> (+0.17%)	⬆️
src/query.jl	96.96% <0.00%> (+0.19%)	⬆️

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[timholy]

OSX stuck. Merge anyway.