Remove redundant Django 1.11 references

docs/tutorial-relay.rst

@@ -281,7 +281,7 @@ from the command line.
     $ python ./manage.py runserver
 
     Performing system checks...
-    Django version 1.11, using settings 'cookbook.settings'
+    Django version 3.1.7, using settings 'cookbook.settings'
     Starting development server at http://127.0.0.1:8000/
     Quit the server with CONTROL-C.
 

graphene_django/converter.py

@@ -238,10 +238,7 @@ def convert_onetoone_field_to_djangomodel(field, registry=None):
         if not _type:
             return
 
-        # We do this for a bug in Django 1.8, where null attr
+        return Field(_type, required=not field.null)
-        # is not available in the OneToOneRel instance
-        null = getattr(field, "null", True)
-        return Field(_type, required=not null)
 
     return Dynamic(dynamic_type)
 

graphene_django/settings.py

@@ -16,10 +16,7 @@ from __future__ import unicode_literals
 from django.conf import settings
 from django.test.signals import setting_changed
 
-try:
+import importlib  # Available in Python 3.1+
-    import importlib  # Available in Python 3.1+
-except ImportError:
-    from django.utils import importlib  # Will be removed in Django 1.9
 
 
 # Copied shamelessly from Django REST Framework

setup.py

@@ -51,7 +51,6 @@ setup(
         "Programming Language :: Python :: 3.8",
         "Programming Language :: Python :: Implementation :: PyPy",
         "Framework :: Django",
-        "Framework :: Django :: 1.11",
         "Framework :: Django :: 2.2",
         "Framework :: Django :: 3.0",
     ],

tox.ini

@@ -26,8 +26,6 @@ setenv =
 deps =
     -e.[test]
     psycopg2-binary
-    django111: Django>=1.11,<2.0
-    django111: djangorestframework<3.12
     django20: Django>=2.0,<2.1
     django21: Django>=2.1,<2.2
     django22: Django>=2.2,<3.0