What's new?

• Fixed panic when use ru lang for translation, thanks @anisov for the PR
• Add boolean baked-in validator to check a string value is a valid boolean representation, thanks @xvello for the PR
• Document thread safety and recommended singleton usage, thanks @andrascz for the PR
• Add validations for ISO 4217 currency codes, thanks @metinogurlu for the PR
• Update universal-translator and locales dependencies to their latest versions.