Add a changelog entry.

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+Fixed: Threads::Thread<T> and Threads::Task<T> objects can now also be
+used when @p T is a type that is only move-constructable or movable,
+but not necessarily copy-constructible or copyable. Consequently, one
+can now also call functions that return such objects on tasks and
+threads. In particular, this is relevant for functions that return
+std::unique_ptr objects that have this property.
+<br>
+(Wolfgang Bangerth, 2018/03/28)