Add a changelog entry.

diff --git a/doc/news/changes/minor/20180927Bangerth-3 b/doc/news/changes/minor/20180927Bangerth-3
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+Deprecated: The Threads::PosixThreadBarrier class and the
+corresponding Threads::Barrier `using` declaration are deprecated. The
+functionality implemented by these classes is easily replaced by C++11
+functionality.
+<br>
+(Wolfgang Bangerth, 2018/09/27)