Add Emoji_Modifier from emoji-data.txt.

src/include/ucd/ucd.h

 #define UCD_PROPERTY_PREPENDED_CONCATENATION_MARK       0x0000000100000000ull /**< @brief Prepended_Concatenation_Mark */
 #define UCD_PROPERTY_EMOJI                              0x0000000200000000ull /**< @brief Emoji */
 #define UCD_PROPERTY_EMOJI_PRESENTATION                 0x0000000400000000ull /**< @brief Emoji_Presentation */
+#define UCD_PROPERTY_EMOJI_MODIFIER                     0x0000000800000000ull /**< @brief Emoji_Modifier */
 
 /** @brief Return the properties of the specified codepoint.
  *
 		Prepended_Concatenation_Mark = UCD_PROPERTY_PREPENDED_CONCATENATION_MARK, /**< @brief Prepended_Concatenation_Mark */
 		Emoji = UCD_PROPERTY_EMOJI, /**< @brief Emoji */
 		Emoji_Presentation = UCD_PROPERTY_EMOJI_PRESENTATION, /**< @brief Emoji_Presentation */
+		Emoji_Modifier = UCD_PROPERTY_EMOJI_MODIFIER, /**< @brief Emoji_Modifier */
 	};
 
 	/** @brief Return the properties of the specified codepoint.

src/proplist.c

 		if (c == 0xFFE3)                return UCD_PROPERTY_DIACRITIC;
 		break;
 	case 0x01F300:
-		return UCD_PROPERTY_EMOJI | UCD_PROPERTY_EMOJI_PRESENTATION;
+		return UCD_PROPERTY_EMOJI | UCD_PROPERTY_EMOJI_PRESENTATION | UCD_PROPERTY_EMOJI_MODIFIER;
 	}
 	return 0;
 }

tools/printdata.py

 	props += (2 ** 32) * data.get('Prepended_Concatenation_Mark', 0)
 	props += (2 ** 33) * data.get('Emoji', 0) # emoji-data
 	props += (2 ** 34) * data.get('Emoji_Presentation', 0) # emoji-data
+	props += (2 ** 35) * data.get('Emoji_Modifier', 0) # emoji-data
 	return props
 
 if __name__ == '__main__':