Support Peewee 3

[lyschoening]

No description provided.

[shayneoneill]

I guess this never got fixed? Maybe worth putting a note up that peewee3 isn't supported. This has bitten me pretty hard.

[shayneoneill]

The fixes, by the way, seem to be

if column.primary_key or model._meta.name in model._meta.refs: (mentioned in linked issue, change rel to refs)

and

meta['name'] = model._meta.db_table.lower() becomes meta['name'] = model._meta.table_name.lower()