change yourdomain to example.org, re-add unreleased section

CHANGELOG.md

 # Changelog
 
+## [Unreleased]
+
+No unreleased changes yet.
+
 ## [0.3.0] - 2019-12-24
 
 * Release candidate for beta tests
 * Added features:
-  * Single Sign on system at sso.oas.yourdomain
-  * User panel at admin.oas.yourdomain
+  * Single Sign on system at sso.oas.example.org
+  * User panel at admin.oas.example.org
   * Rocket.chat version 2.1.1 at chat.oas.yourdomain
   * Use Flux instead of Helmfile to install and update applications
     * Flux version 1.16.0 and helm-operator version 1.0.0-rc4