Fix login by changing button selector on main page

[marcusvx]

• The login function was not working because, apparently, there's no more an ID on the login button. So, changing the id selector to a class, made it work again.

[viniciusgava]

Thanks for the PR @marcusvx, I will merge and release a new version in the next few days.

[viniciusgava]

@marcusvx Released: https://github.com/viniciusgava/itauscraper/releases/tag/1.4.2