Add incompatibility changelog on 'p::d::Tria' data transfer interface.

diff --git a/doc/news/changes/incompatibilities/20180707Fehling b/doc/news/changes/incompatibilities/20180707Fehling
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+Changes: The data transfer interface of the class
+`parallel::distributed::Triangulation` now requires different kinds of
+callback functions. `register_data_attach()` now takes
+`std::function<std::vector<char>(cell_iterator &, CellStatus)>`,
+which returns the buffer of the packed data. `notify_ready_to_unpack()`
+requires `std::function<void(const cell_iterator &, const CellStatus,
+const boost::iterator_range<std::vector<char>::const_iterator &>`, where
+the last argument describes an iterator range, from which the callback
+function is allowed to read.
+<br>
+(Marc Fehling, 2018/07/07)