Add a note about not updated diagram (#248)

Signed-off-by: Franco Cipollone <[email protected]>

andino_hardware/README.md

@@ -25,6 +25,9 @@ This package aims to provide the necessary information to the correct assembly o
 
 <img src="docs/arduino_motor_diagram.png" />
 
+**Important❗: As of a recent update recent update ([#215](https://github.com/Ekumen-OS/andino/pull/215)), the A4 and A5 connections were moved to A2 and A3. This diagram will be updated soon. Refer to [andino_firmware/src/hw.h](../andino_firmware/src/hw.h) for pinout reference.**
+
+
 Some frequent errors:
  - If one of the motors rotates in the opposite direction (think about the orientation of the motors in the chassis) probably the output(+ and -) of the L298N's output should be toggled.
  - When moving forward the encoder values should increase while moving backwards they should decrease. If it is happening the other way around probably the A and B encoder signals should be toggled.