Add [BZ #21828] to ChangeLog

diff --git a/ChangeLog b/ChangeLog
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@@ -1,5 +1,6 @@
 2017-07-26  Mike FABIAN  <mfabian@redhat.com>
 
+       [BZ #21828]
        * NEWS: Mention that the Unicode 10.0.0 update causes user visible changes.
 
 2017-07-26  Siddhesh Poyarekar  <siddhesh@sourceware.org>