* Add source_url_pattern to be able to use the "link to source" button
* Add README.md as an "extra" where it wasn't already
* Add a `main` setting. They all have a very obvious main module. Set
that as `main`, so a user is shown this immediately instead of a list
of usually only this module.
* Improve span_name
Use span_name if provided. Fallback to url.path if there is no
path_params.
* Add unreleased changelog
* Update examples and module description
* Change span_name and http.url to follow OTEL spec
* Remove unused function
* Improve changelog
* Fix reading span_name from request.options
* Don't use URI.path
* address changelog
