Update psycopg2 to 2.7.4

[pyup-bot]

There's a new version of psycopg2 available.
You are currently using 2.7.1. I have updated it to 2.7.4

These links might come in handy: PyPI | Changelog | Homepage

Changelog

2.7.4

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

• Moving away from installing the wheel package by default.
  Packages installed from wheel raise a warning on import. Added package
  psycopg2-binary to install from wheel instead (:ticket:543).
• Convert fields names into valid Python identifiers in
  ~psycopg2.extras.NamedTupleCursor (:ticket:211).
• Fixed Solaris 10 support (:ticket:532).
• cursor.mogrify() can be called on closed cursors (:ticket:579).
• Fixed setting session characteristics in corner cases on autocommit
  connections (:ticket:580).
• Fixed ~psycopg2.extras.MinTimeLoggingCursor on Python 3 (:ticket:609).
• Fixed parsing of array of points as floats (:ticket:613).
• Fixed ~psycopg2.__libpq_version__ building with libpq >= 10.1
  (:ticket:632).
• Fixed ~cursor.rowcount after ~cursor.executemany() with :sql:RETURNING
  statements (:ticket:633).
• Fixed compatibility problem with pypy3 (:ticket:649).
• Wheel packages compiled against PostgreSQL 10.1 libpq and OpenSSL 1.0.2n.
• Wheel packages for Python 2.6 no more available (support dropped from
  wheel building infrastructure).

2.7.3.2

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

• Wheel package compiled against PostgreSQL 10.0 libpq and OpenSSL 1.0.2l
  (:tickets:601, 602).

2.7.3.1

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

• Dropped libresolv from wheel package to avoid incompatibility with
  glibc 2.26 (wheels ticket 2).

2.7.3

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

• Restored default :sql:timestamptz[] typecasting to Python !datetime.
  Regression introduced in Psycopg 2.7.2 (:ticket:578).

2.7.2

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

• Fixed inconsistent state in externally closed connections
  (:tickets:263, 311, 443). Was fixed in 2.6.2 but not included in
  2.7 by mistake.
• Fixed Python exceptions propagation in green callback (:ticket:410).
• Don't display the password in connection.dsn when the connection
  string is specified as an URI (:ticket:528).
• Return objects with timezone parsing "infinity" :sql:timestamptz
  (:ticket:536).
• Dropped dependency on VC9 runtime on Windows binary packages
  (:ticket:541).
• Fixed segfault in ~connection.lobject() when mode=\ !None
  (:ticket:544).
• Fixed ~connection.lobject() keyword argument lobject_factory
  (:ticket:545).
• Fixed ~psycopg2.extras.ReplicationCursor.consume_stream()
  keepalive_interval argument (:ticket:547).
• Maybe fixed random import error on Python 3.6 in multiprocess
  environment (:ticket:550).
• Fixed random !SystemError upon receiving abort signal (:ticket:551).
• Accept ~psycopg2.sql.Composable objects in
  ~psycopg2.extras.ReplicationCursor.start_replication_expert()
  (:ticket:554).
• Parse intervals returned as microseconds from Redshift (:ticket:558).
• Added ~psycopg2.extras.Json !prepare() method to consider connection
  params when adapting (:ticket:562).
• ~psycopg2.errorcodes map updated to PostgreSQL 10 beta 1.

Got merge conflicts? Close this PR and delete the branch. I'll create a new PR for you.

Happy merging! 🤖