Add missing bug number to ChangeLog

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 2016-11-25  Jim Meyering  <meyering@fb.com>
 
+       [BZ #20386]
        Let gcc detect assert(a = 1) errors.
        * assert/assert.h (assert) Rewrite, retaining the old definintion
        when required, but otherwise putting the expression as-is in an "if"