doc: add v3 pictures

README.md

@@ -1,7 +1,7 @@
 The USB-C cable tester shows which features a USB-C to USB-C cable supports.
 
-<img src="picture/v2_front.webp" title="front" height="250"/>
-<img src="picture/v2_back.webp" title="back" height="250"/>
+<img src="picture/v3_front.webp" title="front" height="250"/>
+<img src="picture/v3_back.webp" title="back" height="250"/>
 
 purpose
 =======
@@ -27,7 +27,7 @@ usage
 
 Plug both ends of the USB-C cable in the tester and read the lights:
 
-<img src="picture/v2_ff.webp" title="Full-Featured cable" height="250"/>
+<img src="picture/v3_ff.webp" title="Full-Featured cable" height="250"/>
 
 - SHIELD: ensures the cable is shielded, important for super speed data transfer.
 - POWER: ensures the VBUS and GND wires are present, required to power a device.