Update README.md

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@@ -59,7 +59,7 @@ echo -n "5" > /sys/bus/hid/devices/0003:046D:C24D.XXXX/logitech-g710/led_macro
 
 Writing the led_keys is a bit more involved. The file expects a single digit which is constructed in the following way:
 <pre>
-value= wasd << 4 | key
+value= wasd &lt;&lt; 4 | key
 
 where: 
    wasd - WASD light intensity