Rebase to latest upstream release per NEWS file
    
    What's new in psycopg 2.8.3
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^
    
    - Added *interval_status* parameter to
      `~psycopg2.extras.ReplicationCursor.start_replication()` method and other
      facilities to send automatic replication keepalives at periodic intervals
      (:ticket:`#913`).
    - Fixed namedtuples caching introduced in 2.8 (:ticket:`#928`).