Add sponsorship links to the PyPI page.

Author: Julian

setup.cfg

@@ -2,6 +2,8 @@
 name = jsonschema
 url = https://github.com/python-jsonschema/jsonschema
 project_urls =
+    Funding = https://github.com/sponsors/Julian
+    Tidelift = https://tidelift.com/subscription/pkg/pypi-jsonschema?utm_source=pypi-jsonschema&utm_medium=referral&utm_campaign=pypi-link
     Documentation = https://python-jsonschema.readthedocs.io/en/latest/
     Source = https://github.com/python-jsonschema/jsonschema
     Issues = https://github.com/python-jsonschema/jsonschema/issues/