Support single-line comment for "falls through"

[cowwoc]

Following up on #18 please allow:

// falls through instead of just /* falls through */

[KylePDavis]

I would also like to see this. 👍

I've also noticed (also mentioned in #18) this seems to stop working if I add whitespace or comments between the two cases:

var t = typeof obj;
switch (t) {
  case "object":
    obj = String(obj);
    /* falls through */
    //  ...stops working if whitespace or comments are placed here...
  case "string":
    console.log(obj);
}

[pygy]

I have this in my code, currently:

// fall through for handling declarations. The next line is for JSHint.
/* falls through */

It would b nice if it could simply be

// falls through for handling declarations.

or

/* falls through */
/* ... for handling declarations.*/