2 leds blinking with 2 different threads

Revision:
0:05b174e27260
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-os.lib	Thu Nov 15 13:56:51 2018 +0000
@@ -0,0 +1,1 @@
+https://github.com/armmbed/mbed-os/#bf6f2c3c6434a6de9eb9511feffa5948b3d1f20f