US US_STATES is sorted incorrectly

[ses4j]

https://github.com/django/django-localflavor/blob/master/localflavor/us/us_states.py

The US_STATES enum is sorted by state code, but STATE_CHOICES (and old Django versions such as https://github.com/django/django/commit/4b2b2eda24) are sorted by state name. The net effect is that Nevada SHOULD sort before New Jersey, but in fact sorts after since NV is after NJ.

[benkonrath]

@ses4j Thanks for letting us know. Any chance you can make a PR to fix this?

[ses4j]

@benkonrath done.