Switch to angled header import

Author: alexstaravoitau

ios/RNIterableAPI/RNIterableAPI.mm

@@ -17,7 +17,7 @@ typedef NS_ENUM(NSInteger, InAppShowResponse) {
   skip = 1,
 };
 
-#import "Iterable_React_Native_SDK-Swift.h"
+#import <Iterable_React_Native_SDK/Iterable_React_Native_SDK-Swift.h>
 
 @interface RNIterableAPI () <ReactIterableAPIDelegate>
 @end