better dev version install command

README.md

@@ -25,11 +25,12 @@ For further information, please have a look at the Vignettes and the Manual.
 Installation
 ------------
 
-`mortAAR` is available on [CRAN](https://CRAN.R-project.org/package=mortAAR) and can be installed through `install.packages("mortAAR")`. You can use [devtools](https://CRAN.R-project.org/package=devtools) to install the development version. To do so:
+`mortAAR` is available on [CRAN](https://CRAN.R-project.org/package=mortAAR) and can be installed through `install.packages("mortAAR")`. You can also install the development version with:
 
-    if(!require('devtools')) install.packages('devtools')
-    library(devtools)
-    install_github('ISAAKiel/mortAAR')
+```
+if(!require('remotes')) install.packages('remotes')
+remotes::install_github('ISAAKiel/mortAAR', build_vignettes = TRUE)
+```
 
 Licence
 -------