add a changelog entry

diff --git a/doc/news/changes/minor/20190905MatthiasMaier b/doc/news/changes/minor/20190905MatthiasMaier
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+New: compare_and_apply_mask() allows to use a ternary operater idiom with
+VectorizedArray that is based on generating a mask via component-wise
+comparison. Such a computational idiom is useful as an alternative to
+branching whenever the control flow itself would depend on (computed) data
+(which is not possible for vectorized data).
+<br>
+(Matthias Maier, 2019/09/05)
+