Refer to *current-message*, not *current-words*.

This allows me to "enter" irc-process-line.rkt without error:

    racket@> ,enter "/Users/erichanchrow/git-repositories/Me/rudybot/irc-process-line.rkt"
    irc-process-line.rkt:870:20: *current-message*: unbound identifier in module
      in: *current-message*

vars.rkt

@@ -36,7 +36,7 @@
 
 ;; some state is put globally, to be able to separate functions conveniently
 (define *irc-connection*  (make-parameter #f))
-(define *current-words*   (make-parameter #f))
+(define *current-message* (make-parameter #f))
 (define *response-target* (make-parameter #f))
 (define *for-whom*        (make-parameter #f))
 (define *full-id*         (make-parameter #f))