UNLISTEN is now available in Hot Standby mode in all supported
PostgreSQL versions, therefore there's no reason anymore to wrap
it in DO block. This should significantly speed up connection reset.

There is a small typo in asyncpg/connection.py.

Should read `verification` rather than `verifiction`.

The porting of arm64 builds to Github Actions uncovered an
architecture-specific (or, perhaps, virtualization-specific) bug in
asyncpg, so, rather than blocking the release, drop aarch64 wheels for
now.  Also, `manylinux2014_aarch64` is not considered stable yet
(see pypa/manylinux#84) and so the compiled wheels might not even work
correctly on all aarch64 boxes.

A new asyncpg release is here.

Notable additions include Python 3.9 support, support for recently added
PostgreSQL types like `jsonpath`, and last but not least, vastly
improved `executemany()` performance.  Importantly, `executemany()` is
also now _atomic_, which means that either all iterations succeed, or
none at all, whereas previously partial results would have remained in
place, unless `executemany()` was called in a transaction.

There is also the usual assortment of improvements and bugfixes, see the
details below.

This is the last release of asyncpg that supports Python 3.5, which has
reached EOL last September.

Improvements
------------

* Vastly speedup executemany by batching protocol messages (MagicStack#295)
  (by @fantix in 690048d for MagicStack#295)

* Allow using custom `Record` class
  (by @elprans in db4f1a6 for MagicStack#577)

* Add Python 3.9 support (MagicStack#610)
  (by @elprans in c05d726 for MagicStack#610)

* Prefer SSL connections by default (MagicStack#660)
  (by @elprans in 16183aa for MagicStack#660)

* Add codecs for a bunch of new builtin types (MagicStack#665)
  (by @elprans in b53f038 for MagicStack#665)

* Expose Pool as `asyncpg.Pool` (MagicStack#669)
  (by @rugleb in 0e0eb8d for MagicStack#669)

* Avoid unnecessary overhead during connection reset (MagicStack#648)
  (by @kitogo in ff5da5f for MagicStack#648)

Fixes
-----

* Add a workaround for bpo-37658
  (by @elprans in 2bac166 for #21894)

* Fix wrong default transaction isolation level (MagicStack#622)
  (by @fantix in 4a627d5 for MagicStack#622)

* Fix `set_type_codec()` to accept standard SQL type names (MagicStack#619)
  (by @elprans in 68b40cb for MagicStack#619)

* Ignore custom data codec for internal introspection (MagicStack#618)
  (by @fantix in e064f59 for MagicStack#618)

* Fix null/NULL quoting in array text encoder (MagicStack#627)
  (by @fantix in 92aa806 for MagicStack#627)

* Fix link in connect docstring (MagicStack#653)
  (by @samuelcolvin in 8b313bd for MagicStack#653)

* Make asyncpg work with pyinstaller (MagicStack#651)
  (by @Atem18 in 5ddabb1 for MagicStack#651)

* Fix possible `AttributeError` exception in `ConnectionSettings` (MagicStack#632)
  (by @petriborg in 0d23182 for MagicStack#632)

* Prohibit custom codecs on domains
  (by @elprans in 50f964f for MagicStack#457)

* Raise proper error on anonymous composite input (tuple arguments) (MagicStack#664)
  (by @elprans in 7252dbe for MagicStack#664)

* Fix incorrect application of custom codecs in some cases (MagicStack#662)
  (by @elprans in 50f65fb for MagicStack#662)