Disable require cache while loading other files than JSON

[pkosiec]

Fixes #137

[codecov]

Codecov Report

Merging #142 (2878de3) into master (cf90b72) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #142      +/-   ##
==========================================
+ Coverage   94.20%   94.23%   +0.02%     
==========================================
  Files          18       18              
  Lines         259      260       +1     
  Branches       46       46              
==========================================
+ Hits          244      245       +1     
  Misses          7        7              
  Partials        8        8              

Flag	Coverage Δ
cli	98.03% <ø> (ø)
core	93.30% <100.00%> (+0.03%)	⬆️

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Impacted Files	Coverage Δ
core/src/populator/filesystem.ts	97.29% <100.00%> (+0.07%)	⬆️

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