message: Fix import in react-native ios example
diff: #import <React/RCTBundleURLProvider.h>
  #import <React/RCTRootView.h>
  -#import <React/RNSentry.h>
  #if __has_include(<React/RNSentry.h>)
  #import <React/RNSentry.h> // This is used for versions of react >= 0.40
  #else
  