Suga koubou / Mbed 2 deprecated usbhost_midi

see https://os.mbed.com/users/okini3939/notebook/USBHostMIDI/

Dependencies:   USBHost mbed

Diff: USBHost.lib

Revision:
0:0fd787d62a99
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/USBHost.lib	Wed Jan 03 08:07:31 2018 +0000
@@ -0,0 +1,1 @@
+https://os.mbed.com/users/mbed_official/code/USBHost/#7c3b59bb364e