docs: note the new feature in 3.1

Author: marshallswain

docs/3.0-major-release.md

@@ -16,6 +16,10 @@ Version 3.0 of Feathers-Vuex is the Vue Composition API release!  There were qui
 
 And now it has become the best way to perform queries with Feathers-Vuex.  To find out how to take advantage of the new functionality in your apps, read the [Feather-Vuex Composition API docs](./composition-api.md).
 
+## Custom Handling for Feathers Events <Badge text="3.1.0+" />
+
+Version 3.1 of Feathers-Vuex enables ability to add custom handling for each of the FeathersJS realtime events.  You can read more about it in the [Service Plugin: Events](./service-plugin.md#service-events) docs.
+
 ## A Single Breaking Change
 
 Since Feathers-Vuex follows semantic versioning, a single, small breaking change is the reason for the major version bump. Feathers-Vuex 3.0 has only one breaking change: