fix(pypi): add phonenumbers changelog (#2847)

lib/datasource/pypi.js

@@ -22,6 +22,8 @@ const changelogUrls = {
   flake8: 'http://flake8.pycqa.org/en/latest/release-notes/index.html',
   'django-storages':
     'https://github.com/jschneier/django-storages/blob/master/CHANGELOG.rst',
+  phonenumbers:
+    'https://github.com/daviddrysdale/python-phonenumbers/blob/dev/python/HISTORY.md',
   'psycopg2-binary': 'http://initd.org/psycopg/articles/tag/release/',
 };