This PR update the README.md docs to include the missing options optional parameter on isISO8601 validator.

Checklist

• PR contains only changes related; no stray files, etc.
• README updated (where applicable)
• Tests written (where applicable)

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Thank you very much, I'm happy to contribute (even though is a small change).

Can you send me more issues to work? :)

Thank you for your enthusiasm and interest in this project!
Feel free to contribute by adding a missing locale in one of our validators (See #1761 as an example) or fix an open issue if nobody has not already opened a PR for it.

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