fix iosBiuld

lib/ios/RNNTransitionStateHolder.h

 @property (nonatomic, strong) NSString* fromId;
 @property (nonatomic, strong) NSString* toId;
 @property (nonatomic, strong) RNNAnimatedView* animatedView;
-@property (nonatomic, strong) NSString* isSharedElementTransition;
+@property (nonatomic) BOOL isSharedElementTransition;
 @property (nonatomic, strong) RNNViewLocation* locations;
 @property (nonatomic) BOOL isFromVC;
 @property (nonatomic) double startY;

lib/ios/RNNTransitionStateHolder.m

 	self.toElement = nil;
 	self.animatedView = nil;
 	self.locations  = nil; 
-	self.isSharedElementTransition = [transition objectForKey:@"type"];
+	self.isSharedElementTransition = [[transition objectForKey:@"type"] isEqualToString:@"sharedElement"];
 	return self;
 }