just test of mbed cli and stlink

Dependencies:   mbed ShiftReg

Revision:
0:7d6518934170
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Wed Jan 29 09:56:22 2020 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/2241e3a39974
\ No newline at end of file