Update build command in README to correspond with recent LiteX changes

README.md

@@ -32,7 +32,7 @@ Building the Kestrel BMC for the ECP-5 FPGA on the Versa board is quite straight
 Please see the [Quick Start Guide](https://gitlab.raptorengineering.com/kestrel-collaboration/kestrel-litex/litex/-/wikis/Quick-Start) for setup instructions applicable to the standard Raptor development environment on POWER9.  After the subrepositories are set up, simply run:
 
     cd kestrel/litex/litex-boards/litex_boards/targets
-    ./versa_ecp5.py --device=LFE5UM --cpu-type=microwatt --cpu-variant=standard+ghdl --build --nextpnr-seed 1
+    ./versa_ecp5.py --device=LFE5UM --cpu-type=microwatt --cpu-variant=standard+ghdl+irq --with-ethernet --build --nextpnr-seed 1
 
 # Updating the bitstream with new firmware