* Fix tests so they're compatible with both ujson and pure json library
* Remove redundant wheel dep from pyproject.toml
* Add license trove classifier
* Drop support for Python 3.7 and 3.6
* Allow method handlers to return json rpc errors
* Migrate metadata from `setup.cfg` to PEP 621-compliant `pyproject.toml`
* Use f-strings wherever possible
- Switch to pyproject macros.
OBS-URL: https://build.opensuse.org/package/show/devel:languages:python/python-python-lsp-jsonrpc?expand=0&rev=3