ALS-data-preprocessing.md

@@ -6,10 +6,10 @@ This workflow proposes `R` functions for checking and preprocessing Airborne Las
 The following files are provided:
 * [Rmarkdown source](https://gitlab.irstea.fr/jean-matthieu.monnet/lidartree_tutorials/-/blob/master/R/ALS_data_preprocessing.Rmd),
 * [**ALS data preprocessing tutorial in html**](https://gitlab.irstea.fr/jean-matthieu.monnet/lidartree_tutorials/-/raw/master/export/ALS_data_preprocessing.html?inline=false),
-* [ALS data preprocessing tutorial in pdf](https://gitlab.irstea.fr/jean-matthieu.monnet/lidartree_tutorials/-/blob/master/export/ALS_data_preprocessing.pdf),
 * a [bibliography file](https://gitlab.irstea.fr/jean-matthieu.monnet/lidartree_tutorials/-/blob/master/bib/bibliography.bib)
 * datasets required to run the source code are also available on the repository.
 
 
 Changelog
+* Dec. 27, 2021: future.applu package used for parallelization
 * Sept. 21, 2021: first release
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