update NEWS

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 NLopt 2.1.2 (8 July 2010)
 
+* The Python mconstraint (vector-valued constraint) functions
+  now pass a 2-dimensional array for the gradient argument, rather
+  than a flattened 1d array.
+
 * Return an NLOPT_INVALID_ARGS error if more than n equality constraints
   are added in an n-dimensional problem.