Package install script
install.packages(c("rmarkdown", "devtools", "readr", "tidyr", "ggplot2", "ggthemes", "gridExtra", "dplyr", "lubridate", "GGally", "rworldmap", "ggmap", "scales", "dichromat", "RColorBrewer", "viridis", "purrr", "broom", "timeDate", "haven", "boot", "plotly","gapminder"))