Allow spread operator in race effect

[Nantris]

@pke this is a simple patch that fixes the rule crashing - but all it does is continues if there's a spread operator inside of race - it does not continue to try to detect the use of yield.

[pke]

Thanks for the PR. Can you please provide a code snippet and a test to verify your patch is working?

[Nantris]

Thanks for the interest @pke. That's a completely reasonable request but unfortunately I doubt I will ever be able to find the time.

Here's the approximae code I had that caused me to run into the issue at least though:

const { foo, bar } = yield race({
  ...(bool
    ? {}
    : { foo: take(action => action.type === update.type) }),
  bar: take(action => action.type === setActive.type),
  timeout: delay(5000),
});