Change log entry

diff --git a/doc/news/changes/incompatibilities/20200330DanielArndt b/doc/news/changes/incompatibilities/20200330DanielArndt
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+Removed: The deprecated member function Multigrid::set_debug() has been removed.
+Use the various Multigrid::connect_* functions instead.
+<br>
+(Daniel Arndt, 2020/03/30)