Add host whitelist to is Email validation.
closes: #1912

Add a new option (whitelist host) to isEmail options to check if the email domain is in it or not, if it was not in the whitelist host it fails.

Checklist

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

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LGTM, thanks for your contrib 🎉

// And sorry for the delay in reviewing this.

Just fix the m/c on README and we should be good to go.

Just fix the m/c on README and we should be good to go.

Hi, Thank you. The conflict has been fixed! 🚀

Can this be merged and closed now?