Add changelog entry.

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+Fixed: It was not possible to default-construct objects of type
+`DoFHandler::face_iterator` for `dim==1`. As a consequence, one
+could also not call `cell->face_iterators()` for the cells of 1d
+DoFHandler objects. This is now fixed.
+<br>
+(Wolfgang Bangerth, Tyler Anderson, 2021/08/19)
+