Bump asyncpg from 0.19.0 to 0.20.1

[dependabot-preview]

Bumps asyncpg from 0.19.0 to 0.20.1.

Release notes

Sourced from asyncpg's releases.

asyncpg v0.20.0

Improvements

• Support Python 3.8 (by @1st1 in #504)

• Support PgBouncer by sending only a single SYNC message per query (by @fvannee in b043fbd3)

Bug Fixes

• Handle IP values with prefix in "inet" type as ipaddress.IPvXInterface (by @elprans in 5a4daf71 for #497)

• Close transport if connection times out (by @hexrain in 926f4833 for #468)

• Use faster UUID codecs; make UUID decoding/encoding/operations 2-7x faster (by @1st1 in edde3ff4)

• Use loop.start_tls() to upgrade connections to SSL (by @1st1 in bdba7ce7)

Build

• Bump Cython to 0.29.14 (by @1st1 in 7cb31bc6)

Commits

• 1d4325c asyncpg v0.20.1
• 7be35c4 Bump pgproto
• 851d586 Fix errors in numeric binary decoder
• 2c99beb Add back ensure future for connector
• ae7c110 Bump the version to 0.20.0
• b3fe95d Fix build wheels testing: don't install [test]
• dcef298 Silence 3.8 warnings about implicit int conversion
• bdba7ce Use loop.start_tls() to upgrade connections to SSL
• d655a39 Skip test_adversity on Windows & Python 3.8
• b8483d2 Handle Stream.wait_closed() windows bug gracefully
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #59.