Update NEWS.md

Author: venom1204

NEWS.md

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 14. `fcoalesce()` and `setcoalesce()` gain `nan` argument to control whether `NaN` values should be treated as missing (`nan=NA`, the default) or non-missing (`nan=NaN`), [#4567](https://github.com/Rdatatable/data.table/issues/4567). This provides full compatibility with `nafill()` behavior. Thanks to @ethanbsmith for the feature request and @Mukulyadav2004 for the implementation.
 
 15. New function `isoyear()` has been implemented as a complement to `isoweek()`, returning the ISO 8601 year corresponding to a given date, [#7154](https://github.com/Rdatatable/data.table/issues/7154). Thanks to @ben-schwen and @MichaelChirico for the suggestion and @venom1204 for the implementation.