dplyr, readr, stringr, jsonlite, devtools, roxygen2, testthat,
lubridate, utils, withr
dplyr, readr, stringr, jsonlite, lubridate
dplyr, readr, stringr, jsonlite, lubridate, httr, purrr
dplyr, readr, stringr, jsonlite, lubridate, httr, purrr, curl
knitr, rmarkdown, testthat (>= 2.1.0), covr