Update psycopg2 to 2.7.7

[pyup-bot]

This PR updates psycopg2 from 2.7.5 to 2.7.7.

Changelog

2.7.7

^^^^^^^^^^^^^^^^^^^^^^^^^^^

- Cleanup of the cursor results assignment code, which might have solved
double free and inconsistencies in concurrent usage (:tickets:`346, 384`).
- Wheel package compiled against OpenSSL 1.0.2q.

2.7.6.1

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

- Fixed binary package broken on OS X 10.12 (:ticket:`807`).
- Wheel package compiled against PostgreSQL 11.1 libpq.

2.7.6

^^^^^^^^^^^^^^^^^^^^^^^^^^^

- Close named cursors if exist, even if `~cursor.execute()` wasn't called
(:ticket:`746`).
- Fixed building on modern FreeBSD versions with Python 3.7 (:ticket:`755`).
- Fixed hang trying to :sql:`COPY` via `~cursor.execute()` in asynchronous
connections (:ticket:`781`).
- Fixed adaptation of arrays of empty arrays (:ticket:`788`).
- Fixed segfault accessing the connection's `~connection.readonly` and
`~connection.deferrable` attributes repeatedly (:ticket:`790`).
- `~psycopg2.extras.execute_values()` accepts `~psycopg2.sql.Composable`
objects (:ticket:`794`).
- `~psycopg2.errorcodes` map updated to PostgreSQL 11.
- Wheel package compiled against PostgreSQL 10.5 libpq and OpenSSL 1.0.2p.

Links

• PyPI: https://pypi.org/project/psycopg2
• Changelog: https://pyup.io/changelogs/psycopg2/
• Homepage: http://initd.org/psycopg/

[pyup-bot]

Closing this in favor of #585