replace django.core.urlresolvers with django.urls to appeace Django2.… (#106)

* replace django.core.urlresolvers with django.urls to appeace Django2.0 deprecations
* add try except block around imports for older version support
* add correct django version in setup.py install_reqs

defender/tests.py

@@ -13,10 +13,13 @@ from django import get_version
 from django.contrib.auth.models import User
 from django.contrib.auth.models import AnonymousUser
 from django.contrib.sessions.backends.db import SessionStore
-from django.core.urlresolvers import reverse
 from django.http import HttpRequest, HttpResponse
 from django.test.client import RequestFactory
 from redis.client import Redis
+try:
+    from django.urls import reverse
+except ImportError:
+    from django.core.urlresolvers import reverse
 
 from . import utils
 from . import config

defender/views.py

@@ -1,7 +1,10 @@
 from django.shortcuts import render
 from django.http import HttpResponseRedirect
-from django.core.urlresolvers import reverse
 from django.contrib.admin.views.decorators import staff_member_required
+try:
+    from django.urls import reverse
+except ImportError:
+    from django.core.urlresolvers import reverse
 
 from .utils import (
     get_blocked_ips, get_blocked_usernames, unblock_ip, unblock_username)

setup.py

@@ -68,7 +68,7 @@ setup(name='django-defender',
       include_package_data=True,
       packages=get_packages('defender'),
       package_data=get_package_data('defender'),
-      install_requires=['Django>=1.8,<1.12', 'redis>=2.10.3,<3.0',
+      install_requires=['Django>=1.8,<2.1', 'redis>=2.10.3,<3.0',
                         'mockredispy>=2.9.0.11,<3.0'],
       tests_require=['mock', 'mockredispy', 'coverage', 'celery', 'django-redis-cache'],
       )