POSTGRESQL_VERSION=9.1 is EOL
POSTGRESQL_VERSION=9.1 is EOL

POSTGRESQL_VERSION=9.6 was released September 2016 See if we can run it on travis
stof/dbal,stchr/dbal,lcobucci/dbal,vutung2311/dbal,doctrine/dbal,stof/dbal,kimhemsoe/dbal,kimhemsoe/dbal,gencer/dbal,drieschel/dbal,drieschel/dbal,vutung2311/dbal,gencer/dbal,stchr/dbal,Tobion/dbal,deeky666/dbal,Tobion/dbal,mikeSimonson/dbal,BenMorel/dbal,deeky666/dbal,mikeSimonson/dbal,BenMorel/dbal,lcobucci/dbal,doctrine/dbal