maint: improves state of package development

[yozachar]

maint: improves state of package development

• setup.py is auto generated by poetry build
• pip install -e . and editable install are supported
• minimum required python version is now 3.8
• better development dependency grouping
• adds more option to linting, formatting & type checking
• fix missing git tags for minor version
• MANIFEST.in is now covered by pyproject.toml
• CHANGES.md replaces CHANGES.rst

Related items

Issues

• Closes #129
• Closes #209

This PR will be closed in an hour

[yozachar]

Tags

```txt name commit message 0.1.0 c7af169 v0.1.0 0.2.0 368eec5 v0.2.0 0.3.0 cba75b0 v0.3.0 0.4.0 a862e2b v0.4.0 0.5.0 f6fa327 v0.5.0 0.6.0 340a13c v0.6.0 0.7.0 662b912 v0.7.0 0.8.0 4f4d024 v0.8.0 0.9.0 d5799fb v0.9.0 0.10.0 3bee73b v0.10.0 0.10.1 5f28c39 v0.10.1 0.10.2 b0364c8 v0.10.2 0.10.3 c6735b4 v0.10.3 0.11.0 453cb70 v0.11.0 0.11.1 931f507 v0.11.1 0.11.2 97f5c59 v0.11.2 0.11.3 aeb8502 v0.11.3 0.12.0 9353e61 v0.12.0 0.12.1 8cf1e8f v0.12.1 0.12.2 e3a2557 v0.12.2 0.12.3 a1a535b v0.12.3 0.12.4 fc0eeae v0.12.4 0.12.5 34d355e v0.12.5 0.12.6 26162f0 v0.12.6 0.13.0 0c5a2d3 v0.13.0 0.14.0 b995f81 v0.14.0 0.14.1 0693ced v0.14.1 0.14.2 84dfb21 v0.14.2 0.14.3 39a5f01 v0.14.3 0.15.0 b215b03 v0.15.0 0.16.0 1dd07ab v0.16.0 0.17.0 93fe7ad v0.17.0 0.17.1 f441a09 v0.17.1 0.18.0 1452b46 v0.18.0 0.18.1 78be255 v0.18.1 0.18.2 6657386 v0.18.2 0.19.0 f816ce1 v0.19.0 0.20.0 9c35f18 v0.20.0 ``` `$ git tag name commit^{} -m 'message'`