Add SparseVector to NEWS.md

Author: mbauman

NEWS.md

@@ -24,6 +24,9 @@ Library improvements
   * The function `remotecall`, `remotecall_fetch`, and `remotecall_wait` now have the
     the function argument as the first argument to allow for do-block syntax ([#13338]).
 
+  * A new `SparseVector` type allows for one-dimensional sparse arrays. Slicing
+    and reshaping sparse matrices now can return a vector when appropriate.
+
 Deprecated or removed
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