reflect notification status .isNotifying back ...

[kscheff]

Reflect notification status .isNotifying back and make delegate didUpdateNotificationStateFor for mock implementation available.

When enabling a notification and sending data via .simulateValueUpdate the data is getting lost until the manager caught up with the enabling. Since the enabling is sent async with a delay to an internal queue it takes an uncertain time until data will be sent. The characteristics property .isNotifying is not updated in mock device implementation.

This fix implements a mock delegation didUpdateNotoficationStateFor: and updates .isNotifying property.

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✅ philips77
❌ Kai Scheffer

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[NickKibish]

Everything looks great. Just add a comment for the method, as I asked below.

[NickKibish]

I see that #70 brings the same changes. So I close this PR.