Update README.md

Add references to alternative CAN transceivers

README.md

@@ -89,6 +89,12 @@ provided as both KiCad files and generated Gerber files.
 
 ![PCB Render](pcb/pcb.png)
 
+**NOTE:** U6 (CAN Transceiver) BOM line item references IFX1050GVIOXUMA1 which is no longer in production, please use one of the following instead:
+
+* TJA1057GT/3J
+* TCAN1051
+* MCP2562
+
 ### PCBWay project
 
 The ESP32 OpenLCB IO PCB has been shared via PCBWay [here](https://www.pcbway.com/project/shareproject/ESP32_OpenLCB__LCC__IO_PCB.html).
@@ -139,4 +145,4 @@ for Servo or LED control. This expansion board utilizes a PCA9685 to generate
 16 PWM signals which are routed to a three pin header (GND, 5V and PWM) for
 each output.
 
-![Extension PCB as Servo controller](pcb-servo/pcb-servo.png)
+![Extension PCB as Servo controller](pcb-servo/pcb-servo.png)