added official support for django 3.1

.travis.yml

@@ -29,6 +29,8 @@ matrix:
       env: REQ="Django>=2.2,<3.0"
     - python: "3.6"
       env: REQ="Django>=3.0,<3.1"
+    - python: "3.6"
+      env: REQ="Django>=3.1,<3.2"
     - python: "3.7"
       env: REQ="Django>=1.11,<2.0"
     - python: "3.7"
@@ -39,10 +41,14 @@ matrix:
       env: REQ="Django>=2.2,<3.0"
     - python: "3.7"
       env: REQ="Django>=3.0,<3.1"
+    - python: "3.7"
+      env: REQ="Django>=3.1,<3.2"
     - python: "3.8"
       env: REQ="Django>=2.2,<3.0"
     - python: "3.8"
       env: REQ="Django>=3.0,<3.1"
+    - python: "3.8"
+      env: REQ="Django>=3.1,<3.2"
 before_install:
   - sudo apt-get -y install firefox-geckodriver
 install:

setup.py

@@ -32,7 +32,7 @@ setup(
     packages=find_packages(exclude=["tests"]),
     include_package_data=True,
     install_requires=[
-        "Django>=1.11,<=3.0",
+        "Django>=1.11,<=3.1",
     ],
     classifiers=[
         dev_status,

tox.ini

@@ -9,7 +9,8 @@ envlist =
     {py34,py35,py36,py37}-django20,
     {py35,py36,py37}-django21,
     {py35,py36,py37,py38}-django22,
-    {py36,py37,py38}-django30
+    {py36,py37,py38}-django30,
+    {py36,py37,py38}-django31
 skip_missing_interpreters = true
 
 [testenv]
@@ -19,6 +20,7 @@ deps =
     django21: Django>=2.1,<2.2
     django22: Django>=2.2,<3.0
     django30: Django>=3.0,<3.1
+    django31: Django>=3.1,<3.2
     selenium
 
 commands = {envpython} tests/manage.py test testapp {posargs}