Add should_test_module hook

[tkf]

for JuliaFolds/FoldsCUDA.jl#87

[codecov]

Codecov Report

Merging #3 (3e585c9) into master (95a17cc) will increase coverage by 0.25%.
The diff coverage is 83.33%.

@@            Coverage Diff             @@
##           master       #3      +/-   ##
==========================================
+ Coverage   77.77%   78.03%   +0.25%     
==========================================
  Files           2        2              
  Lines         126      132       +6     
==========================================
+ Hits           98      103       +5     
- Misses         28       29       +1     

Flag	Coverage Δ
Pkg.test	78.03% <83.33%> (+0.25%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/core.jl	78.62% <83.33%> (+0.22%)	⬆️

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