ggplot2, dplyr, stringr, tidyr, tibble, pander
dplyr, ggplot2, lubridate, magrittr, pander, purrr, rlang,
stringr, tidyr
dplyr, ggplot2, lubridate, purrr, rlang, stringr, tidyr
covr, knitr, rmarkdown, rprojroot, testthat