Remove deprecated selected and highlighted methods (#1909)

AsyncDisplayKit/ASCellNode.h

@@ -124,16 +124,6 @@ typedef NS_ENUM(NSUInteger, ASCellNodeVisibilityEvent) {
 
 @end
 
-@interface ASCellNode (Deprecated)
-
-/**
- * Previous versions of ASDK did not include "is" in the name of the getter for these properties.
- * These older accessor methods don't match UIKit naming, and will be removed in a future version.
- */
-- (BOOL)selected ASDISPLAYNODE_DEPRECATED;
-- (BOOL)highlighted ASDISPLAYNODE_DEPRECATED;
-
-@end
 
 /**
  * Simple label-style cell node.  Read its source for an example of custom <ASCellNode>s.

AsyncDisplayKit/ASCellNode.mm

@@ -215,16 +215,6 @@
   }
 }
 
-- (BOOL)selected
-{
-  return self.isSelected;
-}
-
-- (BOOL)highlighted
-{
-  return self.isSelected;
-}
-
 #pragma clang diagnostic push
 #pragma clang diagnostic ignored "-Wobjc-missing-super-calls"