text: Title: Incorrect version requirement in 0.27.0 for asyncpg
  Body: New 0.27.0 version [passes record_class](https://github.com/CanopyTax/asyncpgsa/blob/b9e928ce4a27a2c3964c69cfe5a3189290f1fdaa/asyncpgsa/connection.py#L96) thus being incompatible with asyncpg<0.22.0, but declaration in setup.py [states the opposite](https://github.com/CanopyTax/asyncpgsa/blob/master/setup.py#L13). Probably mistyped `<=` instead of `>=`?
  