update for mbed-os-5.11 (and Nboard IHM-V2)

Dependencies:   IHM_V2

Revision:
28:be81ea276c3a
diff -r edb6c6685907 -r be81ea276c3a IHM_V2.lib
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/IHM_V2.lib	Wed Jan 09 12:26:00 2019 +0000
@@ -0,0 +1,1 @@
+https://os.mbed.com/teams/NBoard/code/IHM_V2/#ad91067e3f6d