Add blurb about Kievan notation to changes (issue 6326056)

[aleksandr . andreev]

Reviewers: ,

Message:
Please review.

Description:
Add blurb about Kievan notation to changes

Adds a blurb and minimal example to changes.tely indicating support of
Kievan notation.

Please review this at http://codereview.appspot.com/6326056/

Affected files:
  M Documentation/changes.tely


Index: Documentation/changes.tely
diff --git a/Documentation/changes.tely b/Documentation/changes.tely
index  
e1c05e52c8befbc4c9cf4c9068c71af828995596..6545c1dd69c8de8ce1ce80753cfb22b054a1449b  
100644
--- a/Documentation/changes.tely
+++ b/Documentation/changes.tely
@@ -60,6 +60,15 @@ which scares away people.
 * only show user-visible changes.

 @end ignore
address@hidden
+Support for Kievan square notation:
address@hidden,relative=1,verbatim]
+\new KievanVoice {
+  \cadenzaOn
+  c d e f g a bes
+  \bar "kievan"
+}
address@hidden lilypond

 @item
 Augmentation dots now avoid the other voice in two-voice polyphony