Update AV1013: Don't cast a base class to one of its derived classes (#349)

Author: dennisdoomen

_rules/1013.md

@@ -1,7 +1,7 @@
 ---
 rule_id: 1013
 rule_category: class-design
-title: Don't refer to derived classes from the base class
+title: Don't cast a base class to one of its derived classes
 severity: 1
 ---
-Having dependencies from a base class to its sub-classes goes against proper object-oriented design and might prevent other developers from adding new derived classes.
+Having dependencies from a base class to its derived classes goes against proper object-oriented design and might prevent other developers from adding new derived classes.