fixed fibonacci es6

fibonacci.js

#!/usr/bin/env node --harmony

'use strict';

var fib = getFibonacci();

init();

function* getFibonacci(){
  let val1 = 0, val2 = 1, swap;

  yield val1;
  yield val2;

  while (true){
    swap = val1 + val2;
    val1 = val2;
    val2 = swap;

    yield swap;
  }
}

function init(){
  let i = 0;

  while ( i < 10 ) {
    console.log(fib.next().value);
    i++;
  }
}