Update changelog for release

git-svn-id: https://svn.apache.org/repos/asf/felix/trunk@1686033 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/framework/doc/changelog.txt b/framework/doc/changelog.txt
index 1bc31c5..31a8574 100644
--- a/framework/doc/changelog.txt
+++ b/framework/doc/changelog.txt
@@ -5,6 +5,7 @@
     * [FELIX-4905] - Framework does not export org.osgi.service.resolver
     * [FELIX-4914] - Resolution problem with identity requirements on fragments
     * [FELIX-4927] - Felix reports itself as an OSGi R4/R5 Framework
+    * [FELIX-4928] - Singleton getService() sometimes incorrectly returns null
 
 ** Improvement
     * [FELIX-4866] - Improve service registry