Ignore a specific distutils warning

Also add comments to remember to turn warnings into errors when running
tests on Python or Django new versions.

Author: mike-perdide

.github/workflows/ci.yml

@@ -11,6 +11,9 @@ on:
 jobs:
   build:
 
+    # When testing new Python or Django versions, one should use the
+    # filterwarnings definition of setup.cfg to turn deprecation warnings
+    # into errors.
     strategy:
       matrix:
         include:

setup.cfg

@@ -60,7 +60,10 @@ testpaths =
     django_genericfilters/tests
     demoproject/tests.py
 filterwarnings =
-    error
+    # Uncomment below when testing a new version of Python or Django so that
+    # DeprecationWarnings can be treated as errors
+    # error
+    ignore:.*distutils Version classes are deprecated.*:DeprecationWarning
 
 DJANGO_SETTINGS_MODULE = demoproject.settings