Add a changelog entry.

diff --git a/doc/news/changes/minor/20211013Bangerth-b b/doc/news/changes/minor/20211013Bangerth-b
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+New: There is now a function ReferenceCell::vertex() that returns the
+coordinates of a vertex of a reference cell.
+<br>
+(Wolfgang Bangerth, 2020/10/13)