Suggestion: membership_types dict. for more intuitive platform selection

[glass-ships]

The integer system works, and is common enough that it doesn't necessarily need to be changed.
But I think a case could be made for matching and working more directly with Bungie's membership type enum.
For example, something like:

membership_types = {
    'none': 0,
    'xbox': 1,
    'psn': 2,
    'steam': 3,
    'blizzard': 4,
    'stadia': 5,
    'demon': 10,
    'bungienext': 254,
    'all': -1
}                   

Then in a pydest method, you could for example do destiny.api.search_destiny_player('steam', 'glass ships#9821') and parse the result as membership_types ['steam'] in the search_destiny_player() method

This is an amazing project by the way, a Python wrapper for the bungie API has long been needed. If there are any areas for contribution, please let me know, I'd be happy to help out however I can to keep this project healthy

[jgayfer]

I'm open to the idea of an enum for this.

Of course we wouldn't want to make any breaking changes, but passing in an enum value could be handy.