add changelog

diff --git a/doc/news/changes/minor/20180821SvenjaSchoeder b/doc/news/changes/minor/20180821SvenjaSchoeder
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+New: Add a mask argument to filter out some vector lanes in FEEvaluationBase
+Complemented by a test, which is almost the same as advect_1d but the distribute_local_to_global is called with the mask argument and each entry is written separately, yielding the same results as the original test.
+This commit is required for local time stepping using the MatrixFree framework, because some cells of batches must be excluded from read/write operations when operating on different time steps compared to their neighbor cells.
+<br>
+(Svenja Schoeder, 2018/08/21)