Log Message:
py-asyncpg: updated to 0.19.0

asyncpg v0.19.0

Improvements
Add support for SCRAM-SHA-256 authentication.
Add PostgreSQL 12 support

Bug Fixes
Remove preexec_fn hack from test cluster management
Fix DeprecationWarning in the docstring of copy_from_query()
Allow specifying the target version when generating the release log
Check for .flake8 after importing flake8
Include .flake8 in PyPI tarball
fix timezone type label in docs
Fix _StatementCache.clear() PS memory leak
fix for warning_callback not yet defined
Fix assertion fail on copy_records_to_table
Do not look for a port in a Unix socket domain path
Unquote connection string components properly
Remove superfluous transaction from a cursor example