Use headers directly in sleep

[blink1073]

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[codecov]

Codecov Report

Merging #20 into master will decrease coverage by 0.30%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master      #20      +/-   ##
==========================================
- Coverage   90.38%   90.07%   -0.31%     
==========================================
  Files           3        3              
  Lines         260      262       +2     
==========================================
+ Hits          235      236       +1     
- Misses         25       26       +1     

Impacted Files	Coverage Δ
pytest_check_links/plugin.py	92.41% <66.66%> (-0.39%)	⬇️

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