Log Message:
py-asyncpg: updated to 0.21.0

asyncpg v0.21.0

Improvements

Add support for password functions (useful for RDS IAM auth)
Add support for connection termination listeners
Update CI matrix, aarch64 builds

Fixes

Fix possible uninitalized pointer access on unexpected array
message data (CVE-2020-17446)
Fix Connection class _copy_in private method
Bump pgproto to fix compilation issues
Improve pool documentation examples
Update usage.rst
Fix links in connection documentation
Fix usage documentation for hstore
Fix compiler warnings