example creating a Ticker with callback

Revision:
2:982ebb531653
Parent:
1:fa1a6e600bdb
--- a/mbed-os.lib	Thu Jan 19 10:48:50 2017 -0600
+++ b/mbed-os.lib	Fri Jun 23 17:44:44 2017 -0500
@@ -1,1 +1,1 @@
-https://github.com/ARMmbed/mbed-os/#04a31f3b39bfbd69e155ed7c9f55880fd75278ba
+https://github.com/ARMmbed/mbed-os/#c9e63f14085f5751ff5ead79a7c0382d50a813a2