Update default EL version to 10.

Author: natefoo

README.md

@@ -32,7 +32,7 @@ Role Variables
 - `postgresql_user_name`: System username to be used for PostgreSQL (default: `postgres`).
 
 - `postgresql_version`: PostgreSQL version to install. On Debian-based platforms, the default is whatever version is
-  pointed to by the `postgresql` metapackage). On RedHat-based platforms, the default is `9.4`.
+  pointed to by the `postgresql` metapackage). On RedHat-based platforms, the default is `10`.
 
 - `postgresql_flavor`: On Debian-based platforms, this specifies whether you want to use PostgreSQL packages from pgdg
   or the distribution's apt repositories. Possible values: `apt`, `pgdg` (default: `apt`).

defaults/main.yml

@@ -1,6 +1,6 @@
 ---
 
-postgresql_default_version: 9.4
+postgresql_default_version: 10
 postgresql_backup_local_dir: ~postgres/backup
 postgresql_backup_active_dir: "{{ postgresql_backup_local_dir }}/active"
 postgresql_backup_mail_recipient: postgres