changelog entry for 64bit fixes

diff --git a/doc/news/changes/major/20200219Heister b/doc/news/changes/major/20200219Heister
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+Fixed: Large computations with more than 4 Billion cells or DoFs
+would run into issues in various situations. Bugs in BlockVector,
+Triangulation, Multigrid, GridRefinement, and other places are
+now fixed.
+<br>
+(Thomas Clevenger, Timo Heister, Martin Kronbichler, Peter Munch, 2020/02/19)