Documentation
* docs: updates README.md ([`30ee988`](https://github.com/danielmbomfim/PyYep/commit/30ee9881147f7f00e4f6e94f83da7d354473f653))
Fix
* fix: fixes bug that cause unexpected errors when passing a None value to a StringValidator ([`e2653f1`](https://github.com/danielmbomfim/PyYep/commit/e2653f1f0b801074d9e70e1a52636f0c5693e830))