add R dependencies

binder/install.R

 ### install regular packages
 
 install.packages("reticulate") # python support in RMarkdown
-# install.packages(c("rmarkdown", "caTools", "bitops")) # for knitting
-# install.packages(tidyverse) # install the entire tidyverse
+install.packages("ggplot2") # for plotting
+install.packages(c("rmarkdown", "caTools", "bitops")) # for knitting
 
 ### install bioconductor packages
 # install.packages("BiocManager")
@@ -10,4 +10,4 @@ install.packages("reticulate") # python support in RMarkdown
 
 ### install GitHub packages (tag = commit, branch or release tag)
 # install.packages("devtools")
-# devtools::install_github("user/repo, ref = "tag")
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+# devtools::install_github("user/repo", ref = "tag")
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