old_contents: import os
  import re
  
  from setuptools import setup
  
  
  def get_version(filename):
      with open(filename, "r") as fp:
          contents = fp.read()
      return re.search(r"__version__ = ['\"]([^'\"]+)['\"]", contents).group(1)
  
  
  version = get_version(os.path.join("corsheaders", "__init__.py"))
  
  with open("README.rst", "r") as readme_file:
      readme = readme_file.read()
  
  with open("HISTORY.rst", "r") as history_file:
      history = history_file.read()
  
  setup(
      name="django-cors-headers",
      version=version,
      description=(
          "django-cors-headers is a Django application for handling the server "
          "headers required for Cross-Origin Resource Sharing (CORS)."
      ),
      long_description=readme + "\n\n" + history,
      author="Otto Yiu",
      author_email="otto@live.ca",
      url="https://github.com/ottoyiu/django-cors-headers",
      packages=["corsheaders"],
      license="MIT License",
      keywords=["django", "cors", "middleware", "rest", "api"],
      install_requires=["Django>=1.11"],
      python_requires=">=3.5",
      classifiers=[
          "Development Status :: 5 - Production/Stable",
          "Environment :: Web Environment",
          "Framework :: Django",
          "Framework :: Django :: 1.11",
          "Framework :: Django :: 2.0",
          "Framework :: Django :: 2.1",
          "Framework :: Django :: 2.2",
          "Intended Audience :: Developers",
          "License :: OSI Approved :: MIT License",
          "Operating System :: OS Independent",
          "Programming Language :: Python",
          "Programming Language :: Python :: 3",
          "Programming Language :: Python :: 3.5",
          "Programming Language :: Python :: 3.6",
          "Programming Language :: Python :: 3.7",
          "Topic :: Software Development :: Libraries :: Application Frameworks",
          "Topic :: Software Development :: Libraries :: Python Modules",
      ],
  )
  
new_contents: import os
  import re
  
  from setuptools import setup
  
  
  def get_version(filename):
      with open(filename, "r") as fp:
          contents = fp.read()
      return re.search(r"__version__ = ['\"]([^'\"]+)['\"]", contents).group(1)
  
  
  version = get_version(os.path.join("corsheaders", "__init__.py"))
  
  with open("README.rst", "r") as readme_file:
      readme = readme_file.read()
  
  with open("HISTORY.rst", "r") as history_file:
      history = history_file.read()
  
  setup(
      name="django-cors-headers",
      version=version,
      description=(
          "django-cors-headers is a Django application for handling the server "
          "headers required for Cross-Origin Resource Sharing (CORS)."
      ),
      long_description=readme + "\n\n" + history,
      author="Otto Yiu",
      author_email="otto@live.ca",
      url="https://github.com/ottoyiu/django-cors-headers",
      project_urls={
          "Changelog": (
              "https://github.com/adamchainz/django-cors-headers"
              + "/blob/master/HISTORY.rst"
          )
      },
      packages=["corsheaders"],
      license="MIT License",
      keywords=["django", "cors", "middleware", "rest", "api"],
      install_requires=["Django>=1.11"],
      python_requires=">=3.5",
      classifiers=[
          "Development Status :: 5 - Production/Stable",
          "Environment :: Web Environment",
          "Framework :: Django",
          "Framework :: Django :: 1.11",
          "Framework :: Django :: 2.0",
          "Framework :: Django :: 2.1",
          "Framework :: Django :: 2.2",
          "Intended Audience :: Developers",
          "License :: OSI Approved :: MIT License",
          "Operating System :: OS Independent",
          "Programming Language :: Python",
          "Programming Language :: Python :: 3",
          "Programming Language :: Python :: 3.5",
          "Programming Language :: Python :: 3.6",
          "Programming Language :: Python :: 3.7",
          "Topic :: Software Development :: Libraries :: Application Frameworks",
          "Topic :: Software Development :: Libraries :: Python Modules",
      ],
  )
  
subject: Add PyPI changelog link (#441)