Also save repl

[lockie]

Hello! I'm using racket-repl-mode pretty often. I've tried to add it to desktop+-special-buffer-handlers, but to no avail - racket-REPL buffers are simply lost upon loading a session using desktop+. What changes should be added to my .emacs to also save racket-REPL (and possibly other similar, e.g. SLIME) buffers in the session?..