change return types for asyncmy

Version 0.5.4 (encode#441)

Version 0.5.3 (encode#398)

Co-authored-by: Marcelo Trylesinski <marcelotryle@gmail.com>

Version 0.5.2 (encode#386)

Version 0.5.1 (encode#380)

Version 0.5.0 (encode#370)

Version 0.4.3 (encode#314)

* Version 0.4.3

* Update CHANGELOG.md

* Update setup.py

* requirements.txt should use setup.py for main package dependancies

* Pin to sqlalchemy<1.4

0.4.2 release (encode#296)

Remove psycopg2 and pymysql from the direct dependencies (encode#256)

Related to encode#204

Version 0.4.0 (encode#255)

Changelog:

- Use backend native fetch_val() implementation when available (encode#132)
- Replace psycopg2-binary with psycopg2 (encode#198) (encode#204)
- Speed up PostgresConnection fetch() and iterate() (encode#193)
- Access asyncpg Record field by key on raw query (encode#207)
- Fix type hinting for sqlite backend (encode#227)
- Allow setting min_size and max_size in postgres DSN (encode#210)
- Add option pool_recycle in postgres DSN (encode#233)
- Fix SQLAlchemy DDL statements (encode#226)
- Make fetch_val call fetch_one for type conversion (encode#246)
- Allow extra transaction options (encode#242)
- Unquote username and password in DatabaseURL (encode#248)