Revert "Update psycopg2 from 2.7.3 to 2.7.3.1"
Revert "Update psycopg2 from 2.7.3 to 2.7.3.1"

This reverts commit dfff2553137df0f44493a6bc9426f743a01e323a.

liqd/a4-meinberlin,liqd/a4-meinberlin,liqd/a4-meinberlin,liqd/a4-meinberlin