Stage-1 Students SoCEM / Mbed OS Task633

updated to mbed os 5.4

Diff: mbed-os.lib

Revision:
11:ae623ddb2eff
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed-os.lib	Mon Apr 03 14:24:10 2017 +0000
@@ -0,0 +1,1 @@
+https://github.com/ARMmbed/mbed-os/#50b3418e45484ebf442b88cd935a2d5355402d7d