Add a changelog entry.

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+Fixed: Previously, it was not possible to iterate over the local range
+of rows of PETSc matrix objects because one would have to call
+`matrix.end(row)` where `row` is the last locally owned row, and that
+triggered an assertion because this end iterator is also the begin
+iterator of the next row -- which is not locally owned any more.
+<br>
+This is now fixed.
+<br>
+(Feimi Yu, Wolfgang Bangerth, 2018/03/20)