DEFAULT_AUTO_FIELD added to suppress warning from django 3.2

TODO

@@ -21,7 +21,3 @@ other known problems:
 - we should add dates to the outputs, to make it more useful in logfiles
 
 - maybe change logo in browser dark mode to https://upload.wikimedia.org/wikipedia/commons/2/2a/Wmde_logo_vert_weiss.png
-
-- warning from django 3.2:
-input.BusinessCard: (models.W042) Auto-created primary key used when not defining a primary key type, by default 'django.db.models.AutoField'.
-	HINT: Configure the DEFAULT_AUTO_FIELD setting or the InputConfig.default_auto_field attribute to point to a subclass of AutoField, e.g. 'django.db.models.BigAutoField'.

foerderbarometer/settings_development.py

@@ -146,3 +146,6 @@ USE_TZ = True
 # https://docs.djangoproject.com/en/3.1/howto/static-files/
 
 STATIC_URL = '/static/'
+
+# needed since django 3.2
+DEFAULT_AUTO_FIELD = 'django.db.models.AutoField'