changelog: encaps tasks

Author: machty

CHANGELOG.md

@@ -1,4 +1,13 @@
 # Changelog
+### 0.8.12
+  - Officially release and document "Encapsulated Tasks", which
+    are tasks that can maintain/mutate their own state without
+    having direct access to the host object's state. In conjunction
+    with Derived State, this allows for some nice patterns for
+    containing state/logic/mutations _within_ the tasks, rather
+    than requiring that state/events generated by tasks live on /
+    bleed into the host objects.
+
 ### 0.8.11
   - Added Task.linked()/unlinked() as a means to avoid circular
     cancelation errors. There is no change to behavior here,