Add changelog.

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+Fixed: MGLevelGlobalTransfer::copy_to_mg would initialize the level vectors
+without ghosts. When combined with Chebyshev smoother and a DiagonalMatrix as
+well as specific matrix-free loops, this could lead to ghosted vectors in
+places where they were not supposed to be ghosted, leading to exceptions. This
+is now fixed.
+<br>
+(Martin Kronbichler, 2019/02/05)