Removes the "+" from the example of WhatsApp IDs in the README

[guilhermecugler]

This update removes the "+" symbol from the example of WhatsApp IDs in the README to ensure clarity and prevent potential timeouts caused by incorrect ID formatting ([country code][phone number]@s.whatsapp.net).
This change addresses issue #34.

[whiskeysockets-bot]

Thanks for your contribution.

The next step is to wait for review and approval to merge it to main repository

The community can help reacting with a thumb up (:thumbsup:) for approval and rocket (:rocket:) for who has tested it.

To test this PR you can run the following command below:

# NPM
npm install @whiskeysockets/baileys@guilhermecugler/Baileys#patch-1
# YARN v2
yarn add @whiskeysockets/baileys@guilhermecugler/Baileys#patch-1