Add aiomysql and aiopg

[iml1111]

What is this Python project?

aiomysql is a "driver" for accessing a MySQL database from the asyncio (PEP-3156/tulip) framework. It depends on and reuses most parts of PyMySQL .

aiopg is a library for accessing a PostgreSQL database from the asyncio (PEP-3156/tulip) framework.

What's the difference between this Python project and similar ones?

These db drivers operate asynchronously. More details are as above.

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