Psycopg 2.7.6 released

What's new in psycopg 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()` (:ticket:`#781`).
- Fixed adaptation of arrays of empty arrays (:ticket:`#788`).
- Fixed segfault accessing the `connection.readonly` and
  `connection.deferrable` repeatedly (:ticket:`#790`).
- `~psycopg2.extras.execute_values()` accepts `~psycopg2.sql.Composable`
  objects (#794).
- `~psycopg2.errorcodes` map updated to PostgreSQL 11.
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