db_table does not work
Hi, guys, I used peewee to build models .
```
class BaseModel(Model):
    class Meta:
        # Mysql connection
        database = DB

class PromotionUser(BaseModel):
    created_at = DateTimeField(default=datetime.datetime.utcnow, index=True)
    # seq_id = PrimaryKeyField(null=False)
    source_uid = CharField()
    source = CharField()
    class Meta:
        db_table = 'promotion_user'
```
PromotionUser.create_table(). the table name is 'promotionuser', not 'promotion_user', could someone plz help?