HDFS-6843. Add to CHANGES.txt

hadoop-common-project/hadoop-common/CHANGES.txt

@@ -530,6 +530,8 @@ Release 2.6.0 - UNRELEASED
 
     HADOOP-10922. User documentation for CredentialShell. (Larry McCay via wang)
 
+    HDFS-6843. Create FileStatus isEncrypted() method (clamb via cmccabe)
+
   OPTIMIZATIONS
 
     HADOOP-10838. Byte array native checksumming. (James Thomas via todd)