Add changelog

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+Improved: The multigrid smoothers now provide an additional apply() method that
+specializes the smoothing for the case the input vector is set to zero. This
+method is used in the Multigrid class and saves one matrix-vector product,
+which can speed up the multigrid algorithm by up to 10 percent, depending on
+the cost of the smoother.
+<br>
+(Martin Kronbichler, 2017/06/07)

diff --git a/doc/news/changes/minor/20170608MartinKronbichler.txt b/doc/news/changes/minor/20170608MartinKronbichler
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rename from doc/news/changes/minor/20170608MartinKronbichler.txt
rename to doc/news/changes/minor/20170608MartinKronbichler