Fix typo in NEWS.md (#2880)

Author: bkamins

NEWS.md

@@ -66,10 +66,10 @@
 * the `DataFrame` constructor when column names are passed to it as a second
   argument now determines if a passed vector of column names is valid based on
   its contents and not element type
-  ([#2829](https://github.com/JuliaData/DataFrames.jl/pull/2859))
+  ([#2859](https://github.com/JuliaData/DataFrames.jl/pull/2859))
 * the `DataFrame` constructor when matrix is passed to it as a first
   argument now allows `copycols` keyword argument
-  ([#2829](https://github.com/JuliaData/DataFrames.jl/pull/2859))
+  ([#2859](https://github.com/JuliaData/DataFrames.jl/pull/2859))
 
 ## Bug fixes