travis: bump postgreSQL to support JSONB
travis: bump postgreSQL to support JSONB

Signed-off-by: Harris Tzovanakis <b1c1d8736f20db3fb6c1c66bb1455ed43909f0d8@drjova.com>

inveniosoftware/invenio-records-ui,inveniosoftware/invenio-records-ui,inveniosoftware/invenio-records-ui