Add Changelog to setup.cfg (#8166)

Co-authored-by: Thomas Grainger <tagrain@gmail.com>
Co-authored-by: Bruno Oliveira <nicoddemus@gmail.com>

Author: 3 people

setup.cfg

@@ -26,6 +26,8 @@ classifiers =
     Topic :: Utilities
 keywords = test, unittest
 project_urls =
+    Changelog=https://docs.pytest.org/en/stable/changelog.html
+    Twitter=https://twitter.com/pytestdotorg
     Source=https://github.com/pytest-dev/pytest
     Tracker=https://github.com/pytest-dev/pytest/issues