Log Message:
py-psycopg2: updated to 2.7.5

What's new in psycopg 2.7.5:
- Allow non-ascii chars in namedtuple fields
- Fixed adaptation of arrays of arrays of nulls
- Fixed building on Solaris 11 and derivatives such as SmartOS and illumos
- Maybe fixed building on MSYS2
- Allow string subclasses in connection and other places
- Don't raise an exception closing an unused named cursor
- Wheel package compiled against PostgreSQL 10.4 libpq and OpenSSL 1.0.2o