add PR #199 to NEWS.md

From: Sebastian Gibb <mail@sebastiangibb.de> git-svn-id: file:///home/git/hedgehog.fhcrc.org/bioconductor/trunk/madman/Rpacks/MSnbase@127877 bc3139a8-67e5-0310-9ffc-ced21a209358
lgatto · Mar 30, 2017 · dfc8f7e · dfc8f7e
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 # MSnbase 2.1
 
 ## Changes in version 2.1.14
-- Internal rewrite and speedup of topN <2017-03-20 Mon>
+- Internal rewrite and speedup of topN; Briefly multiple apply calls are
+  avoided, `getTopIdx` and `subsetById` are replaced by `.topIdx`.
+  See PR #199 for details. <2017-03-20 Mon>
 
 ## Changes in version 2.1.13
 - Internal rewrite and speedup of plotNA <2017-02-26 Sun>