Downgrade to pytest 3.6.4

See https://github.com/pytest-dev/pytest-bdd/issues/250

misc/requirements/requirements-tests.txt

@@ -24,7 +24,7 @@ parse-type==0.4.2
 pluggy==0.7.1
 py==1.5.4
 py-cpuinfo==4.0.0
-pytest==3.7.1
+pytest==3.6.4  # rq.filter: != 3.7, != 3.7.1
 pytest-bdd==2.21.0
 pytest-benchmark==3.1.1
 pytest-cov==2.5.1

misc/requirements/requirements-tests.txt-raw

@@ -4,7 +4,7 @@ coverage
 Flask
 hunter
 hypothesis
-pytest
+pytest<3.7
 pytest-bdd
 pytest-benchmark
 pytest-cov
@@ -19,3 +19,4 @@ pytest-xvfb
 vulture
 
 #@ ignore: Jinja2, MarkupSafe, colorama
+#@ filter: pytest != 3.7, != 3.7.1