* lowercase support, readme updated & added lowercase prop in example

* lowercase tests created & changed hasMinLowercaseChar function to hasMinLowercase

* Feat: support of validating minimum lowercase characters (PR 27)

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Co-authored-by: Bruno Pereira <bruno.pereira@brudam.com.br>
Co-authored-by: Aref Mozafari <arefmozafari.78@gmail.com>