Add a changelog entry.

diff --git a/doc/news/changes/minor/20181120Bangerth b/doc/news/changes/minor/20181120Bangerth
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+Fixed: The TriaAccessor<0,dim,spacedim> and TriaAccessor<0,1,spacedim>
+classes were missing member functions `get_triangulation()` and
+`operator<()`. This prevented these objects from being stored in
+`std::map`s, among other issues.
+<br>
+(Wolfgang Bangerth, Luca Heltai, 2018/11/20)