orjson expects callable for default argument

v2.0.3

orjson expects function or callable for default

Added support of collections.OrderedDict

v2.0.2

added collections.OrderedDict into encoders

Fixed bugs

v2.0.1

updated to DRF upstream version and replaced ujson to orjson

Synced to DRF upstream version and replaced ujson to orison

v2.0.0

updated travis