Fix ujson stubs to properly use AnyStr. (#540)
Fix ujson stubs to properly use AnyStr. (#540)

The ujson module apparently will accept both bytes and text format
input, however, it does always output a str (both on Python 2 and
Python 3).

Some discussion in: https://github.com/python/typeshed/pull/460
azag0/typeshed,tharvik/typeshed,euresti/typeshed,li-dan/typeshed,tharvik/typeshed