Incorrect plugin config file suffixes?

The README.md file mentions in three places that the plugin configuration files should be suffixed `.py` in their name.

Isn't this wrong? As far as I know it should be `.yaml`. In part because SATOSA complains if it's `.py` and in part because the example at e.g. https://github.com/IdentityPython/SATOSA/blob/master/example/plugins/frontends/saml2_frontend.yaml.example is `.yaml`.