news [skip ci]

Author: Jean-Romain

NEWS.md

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 If you are viewing this file on CRAN, please check [the latest news on GitHub](https://github.com/r-lidar/lidR/blob/master/NEWS.md) where the formatting is also better
 
+## lidR v4.2.1 (Release date: 2025-06-02)
+
+- Use `nanoflann` for knn computation
+
 ## lidR v4.2.0 (Release date: 2025-06-02)
 
 - Fix compilation on MacOS