Additional RawSerial example

Revision:
3:c2ec73d1c0b7
Parent:
1:300362127299
diff -r 4ab47f33a1ae -r c2ec73d1c0b7 mbed-os.lib
--- a/mbed-os.lib	Wed Jan 10 14:24:47 2018 +0000
+++ b/mbed-os.lib	Mon Jul 30 14:24:50 2018 -0500
@@ -1,1 +1,1 @@
-https://github.com/ARMmbed/mbed-os/#c9e63f14085f5751ff5ead79a7c0382d50a813a2
+https://github.com/ARMmbed/mbed-os/#50bd61a4a72332baa6b1bac6caccb44dc5423309