Add a changelog.

diff --git a/doc/news/changes/minor/20220707Bangerth b/doc/news/changes/minor/20220707Bangerth
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+New: There are now functions Utilities::MPI::isend() and
+Utilities::MPI::irecv() that can send and receive arbitrary objects to
+and from other processes, and that handle all of the setting up and
+tearing down of MPI objects and temporary buffers.
+<br>
+(Wolfgang Bangerth, 2022/07/07)