Ccy

* Use [holidays](https://github.com/vacanza/holidays) library for tradingcentres (optional extra)
* Fix Act/Act day count bug
* Full mypy

* support python 3.13

What's Changed

* Adds support for python 3.12
* Drop python support for 3.8 and 3.9
* Initial mypy support
* New docs
* Add optional command line tool
* Fix Polish Zloty symbol

**Full Changelog**: https://github.com/quantmind/ccy/compare/v1.3.1...v1.4.0

* bump pytz dependency

* Use poetry
* support python 3.8, 3.9, 3.10 and 3.11
* for earlier python support use previous versions

**Full Changelog**: https://github.com/quantmind/ccy/compare/v1.2.2...v1.3.0

* Add python 3.9 support
* New build script