Replace yield_fixture() by fixture()

[atugushev]

@pytest.yield_fixture is deprecated since pytest-3.0, see: https://docs.pytest.org/en/latest/yieldfixture.html

[codecov-commenter]

Codecov Report

Merging #127 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #127   +/-   ##
=======================================
  Coverage   95.97%   95.97%           
=======================================
  Files           3        3           
  Lines         273      273           
=======================================
  Hits          262      262           
  Misses         11       11           

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[severb]

Thanks!