correcting default bin max value for coils and discrete inputs

Author: dhoomakethu

main.py

@@ -645,7 +645,7 @@ def build_config(self, config):
         config.set('Modbus', "block start", 0)
         config.set('Modbus', "block size", 100)
         config.set('Modbus', "bin min", 0)
-        config.set('Modbus', "bin max", 0)
+        config.set('Modbus', "bin max", 1)
         config.set('Modbus', "reg min", 0)
         config.set('Modbus', "reg max", 65535)