Add 'isOdd' function

[diogorighi]

Hi Kent! Great work with the egghead course. I always wanted to contribute to open source projects but never knew how to start. Thanks for helping ;)

Well, there is an 'isEven' function, but the 'isOdd' is missing! Can I implement that?
Stack Overflow Solution

function isOdd(num) {
  return num % 2 !== 0
}

What do you think?