getRetweets: Returns the list of user IDs that retweeted a specific tweet.
Description
getRetweets connects to the REST API of Twitter and returns a
list of up to 100 user IDs belonging to users who have retweeted the
tweet specified by the id parameter.
## Not run: # ## Download list of recent user IDs retweeting a tweet by Hillary Clinton# rts <- getRetweets(id='653733796408377344', oauth_folder="~/credentials/twitter")# ## End(Not run)