Ignore "The loop argument is deprecated" warning

The loop argument is deprecated, but according to reviewers we still
want to use it. Configuring this in pytest.ini makes AppVeyor and Travis
consistent again.

Author: pquentin

.appveyor.yml

@@ -26,5 +26,5 @@ test_script:
   - "cd empty"
   # Make sure it's being imported from where we expect
   - "python -c \"import os, trio_asyncio; print(os.path.dirname(trio_asyncio.__file__))\""
-  - "python -u -m pytest -W error -ra -v -s --cov=trio_asyncio --cov-config=../.coveragerc ../tests"
+  - "python -u -m pytest -ra -v -s --cov=trio_asyncio --cov-config=../.coveragerc ../tests"
   - "codecov"

setup.cfg

@@ -5,3 +5,6 @@ max-line-length=99
 ignore=E402,E731,E127,E502,E123,W503
 [tool:pytest]
 addopts = -p no:asyncio
+filterwarnings =
+    error
+    ignore:The loop argument is deprecated*:DeprecationWarning