Object of type Timeflake is not JSON serializable

[sebst]

When using TimeflakePrimaryKeyBinary in a Django model, it is not compatible with DRF out of the box because of the above error message.

[anthonynsimon]

Thanks for the PR on this issue! From a first glance it looks good 💯, I will test it out in the coming days.

[sebst]

Thanks for your reply!

In addition to PR #9, I'd suggest to also subclass the TimeflakeBinary class from UUIDField which should solve additional issues with DRF. I'll try to submit another PR in the next days.