canonselphyneo: Add a placeholder for the new Selphy CP1500

It is _not_ currently supported.

README

@@ -25,7 +25,7 @@
   Supported Printers:
 
    Canon SELPHY ES series
-   Canon SELPHY CP series
+   Canon SELPHY CP series (except CP1500)
    Ciaat Brava 21
    Citizen CW-01
    Citizen CW-02 / OP900II
@@ -460,6 +460,10 @@
 
      CP820, CP910
 
+   Not supported (Unknown USB VID/PID):
+
+     CP1500
+
    Valid commands:
 
      -R                 Reset printer to factory defaults

backend_canonselphyneo.c

@@ -519,6 +519,7 @@ const struct dyesub_backend canonselphyneo_backend = {
 		{ 0x04a9, 0x32ae, P_CP910, NULL, "canon-cp1000"},
 		{ 0x04a9, 0x32b1, P_CP910, NULL, "canon-cp1200"},
 		{ 0x04a9, 0x32db, P_CP910, NULL, "canon-cp1300"},
+//		{ 0x04a9, 0x32db, P_CP910, NULL, "canon-cp1500"},
 		{ 0, 0, 0, NULL, NULL}
 	}
 };