bump minimum pg version to 9.5 (current)

Author: flovilmart

.travis.yml

@@ -5,7 +5,7 @@ node_js:
 services:
   - postgresql
 addons:
-  postgresql: '9.4'
+  postgresql: '9.5'
 before_script:
   - ls -al "$HOME/.mongodb/versions"
   - psql -c 'create database parse_server_postgres_adapter_test_database;' -U postgres