Update README.md && Attempt to make code concise.

[aadil42]

function dogs(x) {
    if (x) {
      if (z) {
        return y;
      }
    } else {
      return z;
    }
  }

We can shorten it like this so it's easier to read.

  function dogs(x) {
     if(x && z) return y;
     if(!x) return z;
  }

[ljharb]

This is both much harder to read, and violates our own style guide in multiple ways.

[aadil42]

Okay cool.