Support M487 board

Dependencies:   Modbus nvt_rs485

Revision:
0:dcefb6b411e0
diff -r 000000000000 -r dcefb6b411e0 Modbus.lib
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Modbus.lib	Fri Oct 06 03:12:05 2017 +0000
@@ -0,0 +1,1 @@
+https://developer.mbed.org/users/wclin/code/Modbus/#be466464a18c