allow PHP7 + pdo_pgsql failures on Travis again
allow PHP7 + pdo_pgsql failures on Travis again

vutung2311/dbal,stof/dbal,stof/dbal,stchr/dbal,Tobion/dbal,deeky666/dbal,drieschel/dbal,BenMorel/dbal,deeky666/dbal,lcobucci/dbal,vortgo/dbal,Tobion/dbal,BenMorel/dbal,lcobucci/dbal,doctrine/dbal,kimhemsoe/dbal,mikeSimonson/dbal,mikeSimonson/dbal,doctrine/dbal,v-bartusevicius/dbal,stchr/dbal,v-bartusevicius/dbal,vutung2311/dbal,kimhemsoe/dbal,drieschel/dbal,gencer/dbal,gencer/dbal,vortgo/dbal