Include scan-serial in example configuration file

example.conf

@@ -37,5 +37,12 @@
 "scan-time" : "60",
 "temp-hysteresis" : "3",
 
+"scan-serial" : [
+	"/dev/ttyUSB0",
+	"/dev/ttyUSB1",
+	"/dev/ttyUSB2",
+	"/dev/ttyUSB3"
+],
+
 "kernel-path" : "/usr/local/bin"
 }