Add a changelog entry.

diff --git a/doc/news/changes/minor/20181005Bangerth b/doc/news/changes/minor/20181005Bangerth
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+Deprecated: The Threads::n_existing_threads() and
+Threads::this_thread_id() functions have been deprecated. There are
+equivalent C++11 functions that provide the same kind of
+functionality.
+<br>
+(Wolfgang Bangerth, 2018/10/05)