Add a changelog entry.

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+Deprecated: The Threads::Mutex class is now derived from
+std::mutex. As a consequence, the Threads::Mutex::ScopedLock class is
+now no longer necessary and is deprecated in favor of std::lock_guard
+or any of the other similar classes provided by C++11 and
+later. Similarly, the Threads::Mutex::acquire() and
+Threads::Mutex::release() functions are deprecated in favor of the
+corresponding functions in the std::mutex base class.
+<br>
+(Wolfgang Bangerth, 2018/09/27)