Add a changelog entry.

diff --git a/doc/news/changes/minor/20200521Bangerth b/doc/news/changes/minor/20200521Bangerth
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+Changed: In many other classes that are templated on `dim` and
+`spacedim`, the second template argument `spacedim` had a default
+value equal to `dim`. Particles::DataOut did not, but now does.
+<br>
+(Wolfgang Bangerth, 2020/05/21)