mbed os example for Wislink RAK2011

Revision:
0:4611f6cf2413
Child:
3:3e4aaf05be68
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-os.lib	Thu Mar 08 17:31:37 2018 +0000
@@ -0,0 +1,1 @@
+https://github.com/ARMmbed/mbed-os/#91e6db1ea251ffcc973001ed90477f42fdca5751