docs: Incorporates changes from version v1.0.0-beta.4-7-gf450697
[Full Changelog](https://github.com/ory/oathkeeper/compare/v1.0.0-beta.4...HEAD)
+**Implemented enhancements:**
+
+- rule: Adds validator for rules [\#77](https://github.com/ory/oathkeeper/pull/77) ([arekkas](https://github.com/arekkas))
+
**Fixed bugs:**
- Deletion of conflicting rule doesn't solve the route conflict [\#73](https://github.com/ory/oathkeeper/issues/73)
