Modify gherkin terminal reporter to print tags

[guillego]

As mentioned in #476, this PR implements a simple parser for printing the tags in the verbose gherkin terminal reporter.

[codecov]

Codecov Report

Merging #477 (ef7681b) into master (2fb5a11) will increase coverage by 0.44%.
The diff coverage is 100.00%.

❗ Current head ef7681b differs from pull request most recent head 463bf19. Consider uploading reports for the commit 463bf19 to get more accurate results

@@            Coverage Diff             @@
##           master     #477      +/-   ##
==========================================
+ Coverage   95.48%   95.93%   +0.44%     
==========================================
  Files          48       49       +1     
  Lines        1573     1648      +75     
  Branches      171      179       +8     
==========================================
+ Hits         1502     1581      +79     
+ Misses         44       41       -3     
+ Partials       27       26       -1     

Impacted Files	Coverage Δ
pytest_bdd/gherkin_terminal_reporter.py	82.85% <100.00%> (+2.21%)	⬆️
pytest_bdd/types.py	100.00% <0.00%> (ø)
tests/feature/test_report.py	75.67% <0.00%> (ø)
tests/feature/test_outline.py	100.00% <0.00%> (ø)
tests/feature/test_outline_empty_values.py	100.00% <0.00%> (ø)
tests/args/test_arg_fixture_mix.py	100.00% <0.00%> (ø)
pytest_bdd/scenario.py	91.66% <0.00%> (+0.59%)	⬆️
pytest_bdd/parser.py	99.54% <0.00%> (+1.56%)	⬆️

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[guillego]

@olegpidsadnyi This is my first time contributing, can you guide me through the PR process? Is there anything else I can do?

[arthuRHD]

It might be better to use \tinstead of the space bar for a tabulation.

[arthuRHD]

Same here.

[youtux]

Hi @guillego, this looks like something we would like to merge, but it would needs some tests to be added to the PR.