Support s being missing

[AdrianAtZyte]

Fixes #73.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.97%. Comparing base (a01ca34) to head (8b94eb2).

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #74      +/-   ##
==========================================
+ Coverage   97.94%   97.97%   +0.02%     
==========================================
  Files           5        5              
  Lines         341      345       +4     
  Branches       68       69       +1     
==========================================
+ Hits          334      338       +4     
  Misses          4        4              
  Partials        3        3              

Files with missing lines	Coverage Δ
src/protego/_ruleset.py	98.19% <100.00%> (+0.06%)	⬆️

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