xml2, httr, utils, ari (>= 0.2.3), rmarkdown, pdftools, rvest,
magrittr, mime, tools, stats, jsonlite, text2speech (>= 0.2.8),
docxtractr (>= 0.6.2), tuneR, yaml
knitr, covr, testthat, pagedown, webshot, rstudioapi,
base64enc, xaringan