3.0

Psycopg 3.0 released

- Add :ref:`adapt-shapely` (:ticket:`#80`).
- Add :ref:`adapt-multirange` (:ticket:`#75`).
- Add `pq.__build_version__` constant.
- Don't use the extended protocol with COPY, (:tickets:`#78, #82`).
- Add *context* parameter to `~Connection.connect()` (:ticket:`#83`).
- Fix selection of dumper by oid after `~Copy.set_types()`.
- Drop `!Connection.client_encoding`. Use `ConnectionInfo.encoding` to read
  it, and a :sql:`SET` statement to change it.
- Add binary packages for Python 3.10 (:ticket:`#103`).
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