Add a changelog entry.

diff --git a/doc/news/changes/minor/20220522Bangerth b/doc/news/changes/minor/20220522Bangerth
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+New: The Utilities::pack() and Utilities::unpack() functions are now
+optimized for the rather common case where the argument is of type
+`std::vector<T>` where `T` is a type that can be copied bit by bit
+(using `memcpy()`).
+<br>
+(Wolfgang Bangerth, 2022/05/05)