[NonGNU ELPA] Racket-Mode version 1

[ELPA update]

Version 1 of package Racket-Mode has just been released in NonGNU ELPA.
You can now find it in M-x list-packages RET.

Racket-Mode describes itself as:
  Racket editing, REPL, and more

More at https://elpa.nongnu.org/nongnu/racket-mode.html