Prepending bundle id causes error

### Platform

- [ ] iOS
- [x] macOS
- [ ] tvOS

### In app purchase type

- [ ] Consumable
- [x] Non-consumable
- [ ] Auto-Renewable Subscription
- [ ] Non-Renewing Subscription

### Environment

- [x] Sandbox
- [ ] Production

### Version
0.11.1

### Related issues
N/A

## Report
The macOS demo seems slightly out of date, but Xcode recommends fixes that work for that. Then I run in to the problem that when I attempt to use the functions such as getInfo I get an invalid purchase ID error.

### Issue summary
Using
SwiftyStoreKit.retrieveProductsInfo([appBundleId + "." + purchase.rawValue])
results in an error message about the invalid ID for the purchase, but altering it to:
SwiftyStoreKit.retrieveProductsInfo([purchase.rawValue])
works fine.

Is this to be expected based on store kit changes since the demo was written?