update depandencies readme

README.md

@@ -30,6 +30,8 @@ The following depandencies are mandatory:
 ```
 install.packages(c('car', 'parallel', 'data.table', 'ggplot2', 'gridExtra', 'glmmTMB', 'magrittr', 'MASS', 'plotROC', 'reshape2', 'rlang', 'stats', 'utils', 'BiocManager'))
 BiocManager::install('S4Vectors', update = FALSE)
+## -- optional 
+BiocManager::install('DESeq2', update = FALSE)
 ```
 
 ### System requirements