Enable middleware decorator to work in newer versions of Django

.gitignore

@@ -22,6 +22,7 @@ var/
 *.egg-info/
 .installed.cfg
 *.egg
+pip-wheel-metadata/
 
 # PyInstaller
 #  Usually these files are written by a python script from a template

.travis.yml

@@ -3,10 +3,9 @@ language: python
 cache: pip
 
 python:
-  - "3.7"
-  - "3.6"
-  - "3.5"
-  - "3.8-dev"
+  - '3.8'
+  - '3.7'
+  - '3.6'
 
 install:
   - pip install tox-travis
@@ -17,9 +16,43 @@ script:
 stages:
   - lint
   - test
+  - name: deploy
+    if: tag IS present
 
 jobs:
   include:
     - stage: lint
       script:
         - tox -e lint
+
+    - stage: deploy
+      before_deploy:
+        python setup.py sdist bdist_wheel
+      deploy:
+        - provider: releases  # GitHub releases
+          api_key:
+            secure: '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'
+          file_glob: true
+          file:
+            - dist/django-webmention-*-py3-none-any.whl
+            - dist/django-webmention-*.tar.gz
+          skip_cleanup: true
+          on:
+            tags: true
+            python: '3.8'
+
+        - &pypi  # Production PyPI
+          provider: pypi
+          user: '__token__'
+          password:
+            secure: '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'
+          skip_cleanup: true
+          skip_existing: true
+          on:
+            tags: true
+            python: '3.8'
+
+        - <<: *pypi  # Test PyPI
+          server: 'https://test.pypi.org/legacy/'
+          password:
+            secure: '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'

setup.cfg

@@ -1,6 +1,6 @@
 [metadata]
 name = django-webmention
-version = 1.1.0
+version = 2.0.0
 description = A pluggable implementation of webmention for Django projects
 author = Dane Hillard
 author_email = github@danehillard.com
@@ -13,20 +13,20 @@ classifiers =
     Development Status :: 5 - Production/Stable
     Intended Audience :: Developers
     Framework :: Django
-    Framework :: Django :: 1.8
-    Framework :: Django :: 1.9
-    Framework :: Django :: 1.10
     Framework :: Django :: 1.11
     Framework :: Django :: 2.0
     Framework :: Django :: 2.1
+    Framework :: Django :: 2.2
+    Framework :: Django :: 3.0
+    Framework :: Django :: 3.1
     Topic :: Internet :: WWW/HTTP :: Indexing/Search
     License :: OSI Approved :: MIT License
     Programming Language :: Python
     Programming Language :: Python :: 3 :: Only
     Programming Language :: Python :: 3
-    Programming Language :: Python :: 3.5
     Programming Language :: Python :: 3.6
     Programming Language :: Python :: 3.7
+    Programming Language :: Python :: 3.8
 
 [options]
 package_dir = =src
@@ -69,11 +69,10 @@ DJANGO_SETTINGS_MODULE = tests.test_settings
 python_files =
     tests.py
     test_*.py
-testdirs = tests
 addopts = -ra -q --cov=webmention
 
 [tox:tox]
-envlist = {py35,py36,py37,py38}-django{1.11,2.1,2.2}
+envlist = {py36,py37,py38}-django{1.11,2.1,2.2,3.0,3.1}
 
 [testenv]
 extras = test
@@ -83,6 +82,8 @@ deps =
     django1.11: Django>=1.11,<2
     django2.1: Django>=2.1,<2.2
     django2.2: Django>=2.2,<2.3
+    django3.0: Django>=3.0,<3.1
+    django3.1: Django>=3.1,<3.2
 
 [testenv:lint]
 extras = lint

src/webmention/middleware.py

@@ -1,4 +1,5 @@
 from django.utils.decorators import decorator_from_middleware
+from django.utils.deprecation import MiddlewareMixin
 
 try:
     from django.core.urlresolvers import reverse
@@ -18,7 +19,7 @@ def add_webmention_headers_to_response(request, response):
     return response
 
 
-class WebMentionMiddleware(object):
+class WebMentionMiddleware(MiddlewareMixin):
     def process_response(self, request, response):
         return add_webmention_headers_to_response(request, response)