run "library(ggplot2)"  it doesn't work. i changed to "install.packages("ggplot2")"

run "library(ggplot2)"  it doesn't work. i changed to "install.packages("ggplot2")"
Merge pull request #3 from HAPPYY/patch-3

Actually it should be both :)
run "library(ggplot2)"  it doesn't work. i changed to "install.packages(...