Update asyncpg to 0.18.2

[pyup-bot]

This PR updates asyncpg from 0.18.1 to 0.18.2.

Changelog

0.18.2

Bug Fixes
---------

* Revert "Stop treating ReadyForQuery as a universal result indicator"
to fix stability regression.
(by elprans in 04b67480)

* Correctly ignore all incoming messages after the Terminate message
(by elprans in 787317fb)

* Properly cleanup connections closed by remote
(by elprans in 4393a159 for 385)

Links

• PyPI: https://pypi.org/project/asyncpg
• Changelog: https://pyup.io/changelogs/asyncpg/
• Repo: https://github.com/MagicStack/asyncpg

[coveralls]

Pull Request Test Coverage Report for Build 1336

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 98.308%

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Totals
Change from base Build 1333:	0.0%
Covered Lines:	4008
Relevant Lines:	4077

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💛 - Coveralls