title: React Native ios: cannot be registered to your development team. Change your bundle identifier to a unique string to try again
body: <p>Hello i am new to react native...
  i want to try out my app on my iphone ...
  as we know xcode 8 creates bundle identifier automatically(when we create an app through xcode..not react native)
  it seems in  react native, that we need to change it
  how can i do that?</p>