Update changelog

diff --git a/doc/news/changes/minor/20190603PeterMunch-1 b/doc/news/changes/minor/20190603PeterMunch-1
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-Improved: The function Utilities::MPI::compute_index_owner() is used in 
-Utilities::MPI::Partitioner to avoid global all-to-all communication, 
-speeding up computations on many MPI ranks.
-<br>
-(Peter Munch, 2019/06/03)

diff --git a/doc/news/changes/minor/20190917PeterMunchMartinKronbichler b/doc/news/changes/minor/20190917PeterMunchMartinKronbichler
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+Improved: The ghost setup of Utilities::MPI::Partitioner has been rewritten
+using Utilities::MPI::ConsensusAlgorithm to avoid global all-to-all
+communication, speeding up computations on many MPI ranks.
+<br>
+(Peter Munch, Martin Kronbichler, 2019/09/17)