Setup Travis with checks on 3 R versions

use_ro_travis(browse = interactive(), ext = c("org", "com"))

Arguments

browse

(passed to usethis::use_travis()). Open a browser window to enable automatic builds for the package.

ext

(passed to usethis::use_travis()). which Travis website to use. default to "org"for https://travis-ci.org. Change to "com" for https://travis-ci.com.