Add a changelog entry.

diff --git a/doc/news/changes/minor/20181101Bangerth b/doc/news/changes/minor/20181101Bangerth
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+Fixed: SparsityPattern::begin() and DynamicSparsityPattern::begin()
+resulted in an invalid iterator if the sparsity pattern was actually
+empty.
+<br>
+(Wolfgang Bangerth, Denis Davydov, 2018/11/01)