Re: [w3c/browser-payment-api] How will the spec address versioning / feature detection? (#33)

@ianbjacobs is correct.

Stand to be corrected by @adrianba , @rsolomakhin or @adamroach but my assumption is that code like the following would be used.

How to do this is not something I'd expect in the spec, this is a generic feature detection technique. 

```javascript
if(PaymentOptions.requestShipping) //Check if get Shipping address feature is present
if(PaymentOptions.requestPayerEmail) //Check if get email feature is present
if(PaymentOptions.requestPayerPhone) //Check if get phone feature is present
```

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