Test example project for 3 blinking leds

Revision:
12:56834fc9703d
Parent:
10:c4bec1c9b715
--- a/mbed-os.lib	Fri Mar 01 13:00:20 2019 +0000
+++ b/mbed-os.lib	Fri Mar 01 14:14:56 2019 +0000
@@ -1,1 +1,1 @@
-https://github.com/ARMmbed/mbed-os/#d2202045ac8f2fc63836a5b7131c9b56ac58f06a
+https://github.com/ARMmbed/mbed-os/#51d55508e8400b60af467005646c4e2164738d48