My solution works but Codewars Environment throws and error.
"solution.swift:23:31: error: value of type 'Duration' has no member 'formatted'".

Duration does have the 'formatted()' method.

I get this message when using FrankK's solution:
error: winningNumber.playground:72:13: error: 'random()' is unavailable in Swift: Use arc4random instead.
return (random() % limit)+min

But, arc4Random_uniform, also does not work, although it works perfectly in Playgrounds.