Improvements
------------
* Add support for SCRAM-SHA-256 authentication.
(by @jkatz in 2d76f50d)
* Add PostgreSQL 12 support
(by @elprans in 23261532)
Bug Fixes
---------
* Remove preexec_fn hack from test cluster management
(by @elprans in 36ed11d2)
* Fix DeprecationWarning in the docstring of copy_from_query()
(by @elprans in 482a39ae)
* Allow specifying the target version when generating the release log
(by @elprans in 43a7b213)
* Check for .flake8 after importing flake8
(by @dotlambda in aaeb7076)
* Include .flake8 in PyPI tarball
(by @dotlambda in 43c6b9ce)
* fix timezone type label in docs
(by @claws in e91e4911)
* Fix _StatementCache.clear() PS memory leak
(by @un-def in f4aa9bf4 for #416)
* fix for warning_callback not yet defined
(by @samuelcolvin in 354d9be5)
* Fix assertion fail on copy_records_to_table
(by Petr Reznikov in ae5a89db)
* Do not look for a port in a Unix socket domain path
(by @Lawouach in b773912d for #419)
* Unquote connection string components properly
(by @elprans in 5513b9d3 for #418)
* Remove superfluous transaction from a cursor example
(by @elprans in 32fccaad for #475)