Unable to send messages to numbers from mexico +521

[saadnust]

For numbers of format 521, even if the number exists on the whatsapp, response is showing exists:False

[jrCleber]

In Brazil, there are specific rules for telephone operator numbers that are implemented in the code.

In Mexico there are also these rules, but I don't know them. If you know these rules well, make a pull request and I will review and accept it.

[salomonamiga]

For Mexico you only have to remove the 1