This function lets the user add their bearer token to the .Renviron file.
set_bearer()It is in general not safe to 1) hard code your bearer token in your R script or 2) have your bearer token in your command history.
set_bearer opens the .Renviron file
for the user and provides instructions on how to add the bearer token, which requires the
addition of just one line in the .Renviron file, following the format TWITTER_BEARER=YOURTOKENHERE.
Replace YOURTOKENHERE with your own token.