Support Django 3.0

Also updates the version of PyPy we test against

.travis.yml

@@ -7,7 +7,7 @@ python:
   - "3.6"
   - "3.7"
   - "3.8"
-  - pypy3.5-6.0
+  - pypy3.6-7.1.1
 
 
 install: pip install tox-travis codecov

README.rst

@@ -66,12 +66,12 @@ etc is done elsewhere.
 Supported Django Versions
 =========================
 
-Django 1.11, 2.1, and 2.2 are currently supported by this library.
+Django 2.1, 2.2, and 3.0 are currently supported by this library.
 
 Supported Python Versions
 =========================
 
-Python 2.7, 3.5, 3.6. 3.7, and 3.8 are currently supported by this library.
+Python 3.5, 3.6. 3.7, and 3.8 are currently supported by this library.
 
 Installation
 ============

examples/protected_downloads/download/views.py

@@ -1,5 +1,5 @@
 from django.contrib.auth.decorators import login_required
-from django.shortcuts import get_object_or_404, render_to_response
+from django.shortcuts import get_object_or_404, render
 from django.http import HttpResponseForbidden
 from django.db.models import Q
 from django.template import RequestContext
@@ -29,6 +29,6 @@ def download_list(request):
         downloads = downloads.filter(Q(is_public=True) | Q(users=request.user))
     else:
         downloads = downloads.filter(is_public=True)
-    return render_to_response('download/download_list.html',
-                              {'download_list': downloads},
-                              context_instance=RequestContext(request))
+    return render(request, 'download/download_list.html',
+                  {'download_list': downloads},
+                  context_instance=RequestContext(request))

setup.py

@@ -41,6 +41,8 @@
         'Programming Language :: Python :: 3.7',
         'Programming Language :: Python :: 3.8',
         'Programming Language :: Python',
+        'Programming Language :: Python :: Implementation :: PyPy',
+        'Programming Language :: Python :: Implementation :: CPython',
         'Topic :: Software Development :: Libraries :: Python Modules',
     ],
 )

tox.ini

@@ -1,7 +1,8 @@
 [tox]
 envlist =
     clean
-    py{py3,35,36,37,38}-django{21,22}
+    py{py3,36,37,38}-django{21,22,30}
+    py35-django{21,22}
     flake8
     coverage
 
@@ -10,11 +11,13 @@ usedevelop=True
 deps =
     django21: Django>=2.1,<2.2
     django22: Django>=2.2,<2.3
+    django30: Django>=3.0,<3.1
     coverage
 changedir = examples/protected_downloads
 commands =
     python --version
     coverage run --rcfile=../../.coveragerc -a manage.py test django_sendfile {posargs}
+setenv = PYTHONWARNINGS = default
 
 [travis]
 python =