Spacy-stanza

* Extend stanza support to stanza v1.6.

* Extend stanza support to stanza v1.5.

- Extend stanza support to stanza v1.4.

- Extend stanza support to stanza v1.3.
- Modify fallback for `token.tag` if XPOS is missing from FEATS to UPOS. (Thanks BramVanroy!)

> **This release requires [spaCy v3](https://spacy.io/usage/v3).** See the updated usage documentation for more details: https://github.com/explosion/spacy-stanza/tree/v1.0.0#-usage--examples

✨ New features and improvements

- Refactor library for spaCy v3.0
- Config system integration
- New API for loading a Stanza model following Stanza's `Pipeline` API
- Include morphological analysis under `token.morph`

🔴 Bug fixes

* Fix issue 59: Fix trailing whitespace token handling

🔴 Bug fixes

* Fix issue 56: Add entry points for all supported languages
* Fix issue 59: Fix trailing whitespace token handling