remove django 3.1 support

Author: Javier

.travis.yml

@@ -30,11 +30,6 @@ matrix:
     - {env: DJANGO=3.0, python: 'nightly'}
     - {env: DJANGO=3.0, python: 'pypy3'}
 
-    - {env: DJANGO=master, python: '3.6'}
-    - {env: DJANGO=master, python: '3.7'}
-    - {env: DJANGO=master, python: '3.8'}
-    - {env: DJANGO=master, python: 'nightly'}
-
   allow_failures:
     - python: 'nightly'
     - env: DJANGO=master

setup.py

@@ -14,9 +14,10 @@ def long_description():
 
 setup(
     name='django-db-geventpool',
-    version='3.2.3',
+    version='3.2.4',
     install_requires=[
         'django>=1.11',
+        'django<3.1',
         'psycogreen>=1.0',
     ],
     url='https://github.com/jneight/django-db-geventpool',
@@ -31,6 +32,7 @@ def long_description():
         'Framework :: Django',
         'Framework :: Django :: 1.11',
         'Framework :: Django :: 2.2',
+        'Framework :: Django :: 3.0',
         'Intended Audience :: Developers',
         'License :: OSI Approved :: Apache Software License',
         'Operating System :: OS Independent',

tox.ini

@@ -9,4 +9,3 @@ deps =
   dj11: django~=1.1
   dj22: django~=2.2
   dj30: django~=3.0
-  dj31: django~=3.1