This is a function to get a list of scheduled events from a Calendly user.
Arguments
- token
- You can provide the API key directly using this argument or this function will attempt to grab an API key that was stored using the `authorize("calendly")` function 
- user
- You need to retrieve the Calendly user's URI. You can do this by doing `user <- get_calendly_user()` and `user$resource$uri` 
- count
- The number of responses that should be returned. Default is 20 or you can say "all" to retrieve all. 
Examples
if (FALSE) { # \dontrun{
authorize("calendly")
user <- get_calendly_user()
list_calendly_events(user = user$resource$uri)
} # }