Annotate some new stuff

AsyncDisplayKit/ASMapNode.h

@@ -9,6 +9,8 @@
 #import <AsyncDisplayKit/AsyncDisplayKit.h>
 #import <MapKit/MapKit.h>
 
+NS_ASSUME_NONNULL_BEGIN
+
 @interface ASMapNode : ASImageNode
 
 - (instancetype)initWithCoordinate:(CLLocationCoordinate2D)coordinate NS_DESIGNATED_INITIALIZER;
@@ -16,7 +18,7 @@
 /**
  This is the MKMapView that is the live map part of ASMapNode. This will be nil if .liveMap = NO. Note, MKMapView is *not* thread-safe.
  */
-@property (nonatomic, readonly) MKMapView *mapView;
+@property (nullable, nonatomic, readonly) MKMapView *mapView;
 
 /**
  Set this to YES to turn the snapshot into an interactive MKMapView and vice versa. Defaults to NO.
@@ -38,6 +40,8 @@
  * @discussion This method set the annotations of the static map view and also to the live map view. Passing an empty array clears the map of any annotations.
  * @param annotations An array of objects that conform to the MKAnnotation protocol
  */
-- (void)setAnnotations:(NSArray *)annotations;
+- (void)setAnnotations:(NSArray<id<MKAnnotation>> *)annotations;
 
 @end
+
+NS_ASSUME_NONNULL_END