Make liberal step definitions conform with official gherkin parser

[elchupanebrej]

cucumber/common#1741

[codecov]

Codecov Report

Merging #60 (5a8e1d8) into default (ba8f5d5) will decrease coverage by 0.15%.
The diff coverage is 89.65%.

@@             Coverage Diff             @@
##           default      #60      +/-   ##
===========================================
- Coverage    96.53%   96.38%   -0.16%     
===========================================
  Files           71       71              
  Lines         3863     3896      +33     
  Branches       491      496       +5     
===========================================
+ Hits          3729     3755      +26     
- Misses          90       93       +3     
- Partials        44       48       +4     

Impacted Files	Coverage Δ
pytest_bdd/struct_bdd/ast_builder.py	96.87% <ø> (ø)
tests/struct_bdd/test_steps.py	100.00% <ø> (ø)
pytest_bdd/steps.py	96.77% <71.42%> (-1.60%)	⬇️
pytest_bdd/const.py	92.59% <83.33%> (-7.41%)	⬇️
pytest_bdd/parser.py	98.23% <87.50%> (-0.22%)	⬇️
pytest_bdd/struct_bdd/model.py	92.11% <90.90%> (-0.56%)	⬇️
pytest_bdd/ast.py	100.00% <100.00%> (ø)
pytest_bdd/generation.py	94.28% <100.00%> (ø)
pytest_bdd/model/scenario.py	97.19% <100.00%> (+0.08%)	⬆️
tests/feature/test_steps.py	100.00% <100.00%> (ø)
... and 2 more

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