Autocomplete function Done

[JeonHyungJin]

I added autocomplete function. when you type some email in inputbox, you can see the autocompleted email lists under the inputbox. This can save your time to type those things.

If you want to add other domains you can fix your code. https://github.com/JeonHyungJin/react-multi-email/blob/master/src/react-multi-email/ReactMultiEmail.tsx#L70

result = ['gmail.com', 'naver.com', 'daum.net'].map(domain => `${value}@${domain}`);

If you want to add, modify the domain list, try to modify this result list!

[JeonHyungJin]

I changed isEmail, too.