Update documentation

[msldiarra]

Hello,

It seems ReactBottomNavigationPackage has been renamed to BottomNavigationPackage but remains in your documentation.

Plus the example project is not using any.

Thanks.

[ghost]

And in the third step says 'In your MainActivity.java,...'

It should be 'In your MainApplication.java', I think.

Thanks for this library.

[orhan]

Yes guys, the documentation is a little bit outdated, as I didn't have the time to address this yet, sorry!

I'll add a proper documentation soon .. :)

[santiblanko]

Thanks for your support.