Update pytest from 3.6.1 to 3.6.2 (mozilla#857)

Author: pyup-bot

test/integration/requirements.txt

@@ -2,7 +2,7 @@ selenium==3.12.0
 flake8==3.5.0
 flake8-isort==2.5
 PyPOM==2.0.0
-pytest==3.6.1
+pytest==3.6.2
 pytest-html==1.19.0
 pytest-selenium==1.13.0
 pytest-xdist==1.22.2