message: Made displaName and label optional as they can be null
diff: @@ -20,10 +20,10 @@ NS_ASSUME_NONNULL_BEGIN
  @interface TFLCategory : NSObject
  /** Display name of the class. */
  -@property(nonatomic, copy, readonly) NSString *displayName;
  +@property(nonatomic, copy, readonly, nullable) NSString *displayName;
  /** Class name of the class . */
  -@property(nonatomic, copy, readonly) NSString *label;
  +@property(nonatomic, copy, readonly, nullable) NSString *label;
  /** Confidence score for this class . */
  @property(nonatomic, assign, readonly) float score;
  