Merge pull request #81 from mozilla-services/pyup-update-pytest-html-1.16.1-to-1.17.0

Update pytest-html to 1.17.0

Author: stephendonner

axe_selenium_python/tests/requirements/tests.txt

@@ -1,5 +1,5 @@
 pytest==3.5.0
 selenium==3.11.0
 pytest-selenium==1.12.0
-pytest-html==1.16.1
+pytest-html==1.17.0
 pytest_base_url==1.4.1