Fix generic type of useNavigationParam

[avery-pierce]

This fixes an issue where the return type useNavigationParam wasn't meaningful (it just returns any).

Without generic (backwards compatibility):

With generic (helpful type):

As a side-effect, I think this also fixes #42 since you can now pass the P type in the useNavigation hook (it defaults to the unspecific NavigationParams type)

[Aure77]

@slorber is this repository dead ?

[slorber]

@Aure77 yes, I don't have time to work on it so please reach out to other React-Navigation contributors to see if anyone is willing to backport changes to this older package

Remember that you can always fork and you are never 100% locked