adds versions to doc

doc/event_system.rst

@@ -61,6 +61,10 @@ objects such as links.
 
 serializer.pre_deserialize
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+.. versionadded : 0.12
+    Event was added
+
 This is dispatched before an object is deserialized. You can use this to
 modify submitted data, or modify the type that is being used for deserialization.
 

doc/reference/annotations.rst

@@ -192,6 +192,10 @@ by the object iself.
 
 @Discriminator
 ~~~~~~~~~~~~~~
+
+.. versionadded : 0.12
+    @Discriminator was added
+
 This annotation can to enable deserialization of relations which are polymorphic, but
 where a common base class exists. The ``@Discriminator`` annotation has to be applied
 to the least super type::