Update PostgreSQL version requirement to 9.5

docs/user_guide/install_tripal/server_setup.rst

@@ -6,7 +6,7 @@ Before installation of Tripal, a web server must be configured and ready, and Tr
 1. A UNIX-based server (e.g. Ubuntu Linux or CentOS are the most popularly used).
 2. Web server software. The `Apache web server <https://httpd.apache.org/>`_ is most commonly used.
 3. `PHP <http://php.net/>`_ version 5.6 or higher (the most recent version is recommended).
-4. `PostgreSQL <https://www.postgresql.org/>`_ 9.3 or higher
+4. `PostgreSQL <https://www.postgresql.org/>`_ 9.3 or higher (9.5 required for Chado 1.2 to 1.3 upgrade)
 5. `Drush <http://www.drush.org/en/master/>`_ 7 or higher
 6. `Drupal <https://www.drupal.org/>`_ 7.