v2.3.0

• Potentially breaking change: The somajo-tokenizer script is automatically created upon installation and bin/somajo-tokenizer is removed. For most users, this does not make a difference. If you used to run your own modified version of SoMaJo directly via bin/somajo-tokenizer, consider installing the project in editable mode (see Development section in README.md).
• Switch from setup.py to pyconfig.toml and restructure the project (source in src, tests in tests).
• When creating a Token object, only known token classes can be passed.
• Fix issue #25 (dates at the end of sentences)