Missing syntax highlighting for decorated functions

[nagy]

The new syntax introduced with hylang/hy#2270 is not being recognized by hy-mode. For example:

(import click)

(defn
  [click.command
   (click.option "--name")]
  main [name]
  (print "Hi" name))

(when (= __name__ "__main__") (main))

Here, the defun is not highlighted correctly. The responsible part is probably this:

hy-mode/hy-font-lock.el

Lines 347 to 352 in df81486

	(rx-to-string
	`(: "("
	symbol-start
	(group-n 1 (or ,@hy-font-lock--definitions))
	(1+ space)
	(group-n 2 (1+ word))))