chore: show a Changelog link on PyPI

Author: takis

setup.py

@@ -562,6 +562,7 @@ def is_py_64():
       ext_modules=ext,
       project_urls={
           'Homepage': 'https://psycopg.org/',
+          'Changes': 'https://www.psycopg.org/docs/news.html',
           'Documentation': 'https://www.psycopg.org/docs/',
           'Code': 'https://github.com/psycopg/psycopg2',
           'Issue Tracker': 'https://github.com/psycopg/psycopg2/issues',