If you're wearing a Fitbit right now there's a good chance it's a Fitbit Charge or a Fitbit Charge HR on your wrist – but there's now a new Fitbit in town. The Fitbit Charge 2 is the first upgrade to the popular Charge range since the Charge HR, which appeared early in 2015.The Fitbit Charge 2 brings with it a couple of new features, and along with...