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.

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Yes guys, the documentation is a little bit outdated, as I didn't have the time to address this yet, sorry!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