Allow installing opencensus-ext-django with Django 2.0 and later (#697)

* Update Django docs to use MIDDLEWARE setting

* Allow installing opencensus-ext-django with Django 2.0 and later

Fixes #538

Author: timgraham

contrib/opencensus-ext-django/CHANGELOG.md

@@ -3,6 +3,7 @@
 ## Unreleased
 - Make ProbabilitySampler default
 - Remove support for Django < 1.11.
+- Allow installing with Django 2.0 and later.
 
 ## 0.3.0
 Released 2019-04-24

contrib/opencensus-ext-django/README.rst

@@ -17,11 +17,11 @@ Usage
 -----
 
 For tracing Django requests, you will need to add the following line to
-the ``MIDDLEWARE_CLASSES`` section in the Django ``settings.py`` file.
+the ``MIDDLEWARE`` section in the Django ``settings.py`` file.
 
 .. code:: python
 
-    MIDDLEWARE_CLASSES = [
+    MIDDLEWARE = [
         ...
         'opencensus.ext.django.middleware.OpencensusMiddleware',
     ]

contrib/opencensus-ext-django/setup.py

@@ -26,6 +26,10 @@
         'Development Status :: 3 - Alpha',
         'Intended Audience :: Developers',
         'License :: OSI Approved :: Apache Software License',
+        'Framework :: Django',
+        'Framework :: Django :: 1.11',
+        'Framework :: Django :: 2.1',
+        'Framework :: Django :: 2.2',
         'Programming Language :: Python',
         'Programming Language :: Python :: 2',
         'Programming Language :: Python :: 2.7',
@@ -39,7 +43,7 @@
     include_package_data=True,
     long_description=open('README.rst').read(),
     install_requires=[
-        'Django >= 1.11.0, < 1.12.0',
+        'Django >= 1.11',
         'opencensus >= 0.7.dev0, < 1.0.0',
     ],
     extras_require={},

docs/trace/usage.rst

@@ -208,11 +208,11 @@ Django
 ~~~~~~
 
 For tracing Django requests, you will need to add the following line to
-the ``MIDDLEWARE_CLASSES`` section in the Django ``settings.py`` file.
+the ``MIDDLEWARE`` section in the Django ``settings.py`` file.
 
 .. code:: python
 
-    MIDDLEWARE_CLASSES = [
+    MIDDLEWARE = [
         ...
         'opencensus.trace.ext.django.middleware.OpencensusMiddleware',
     ]