Prepare release 0.4.0

Change-Id: I361b0a37f48c729b31ea6a61aefb513c8d3d670f
diff --git a/docs/release-notes.rst b/docs/release-notes.rst
index 96d796b..4da744b 100644
--- a/docs/release-notes.rst
+++ b/docs/release-notes.rst
@@ -1,4 +1,4 @@
 Release Notes
 =============
 
-.. include:: release-notes/release-notes-0.3.0.rst
+.. include:: release-notes/release-notes-0.4.0.rst