Disable pytest-warnings which cause random test failures.

Themanwithoutaplan · Themanwithoutaplan · commit cd7683f016c5 · 2017-05-25T12:21:51.000+02:00
See pytest-dev/pytest#2430 --HG-- branch : 2.4
diff --git a/pytest.ini b/pytest.ini
@@ -1,5 +1,5 @@
 [pytest]
-addopts = -l --strict
+addopts = -l --strict -p no:warnings
 norecursedirs = lib include openpyxl/Issues .tox local
 python_files = test_*.py
 
