Update .gitignore for pytest 3.4+

PiDelport · web-flow · commit f4b21c7a75fc · 2018-02-08T01:31:12.000+02:00
Pytest 3.4.0 changes the default cache directory from `.cache` to `.pytest_cache`. Changelog: https://docs.pytest.org/en/latest/changelog.html#pytest-3-4-0-2018-01-30
diff --git a/.gitignore b/.gitignore
@@ -42,6 +42,7 @@ htmlcov/
 .coverage
 .coverage.*
 .cache
+.pytest_cache
 nosetests.xml
 coverage.xml
 *,cover
