setState add for Notify listener, fixed #2

[tgajdo]

Current behavior:

Notify button doesn't update the state so no value appears on the UI. Another button needs to be pressed which updates state in order to see the new value from Notify

Expected behavior:

Notify button updates the state properly and shows new value on every event

Fixed #2

[tgajdo]

@jenow if you have time please take a look, this tutorial helped me out quite a bit, but this bug did cause quite a few headache, till I realised what's the problem :)

[Abhishek01039]

Hello @tgajdo how you change the color of BLE device?