Add encrypted Travis environment variable to git directory and .travis.yml.
tencrypt(
  r_obj = Sys.getenv("GITHUB_PAT"),
  travis_env = "GITHUB_PAT",
  add = TRUE
)object value to encrypt
character, name of Travis environment variable
boolean, add directly to .travis.yml, Default: TRUE
Other setup: 
make_badge(),
use_covrpage_vignette(),
use_covrpage()