SafeDetect / Mbed OS tx_serial_from_pi

this works for reading in data from pi via usb

Diff: README.md

Revision:
84:9b22d3bf66f7
Parent:
83:7b0fac4e7fd2
Child:
85:b4c5dbbf74e3
--- a/README.md	Fri Nov 30 23:45:02 2018 +0000
+++ b/README.md	Thu Dec 13 14:15:02 2018 +0000
@@ -114,7 +114,7 @@
 
 The default baud rate for this application is set to `115200` and may be modified in the `mbed_app.json` file.
 
-You can find more information on the Mbed OS configuration tools and serail communication in Mbed OS in the related [related links section](#related-links).
+You can find more information on the Mbed OS configuration tools and serial communication in Mbed OS in the related [related links section](#related-links).
 
 The output should contain the following block transmitted at the blinking LED frequency (actual values may vary depending on your target, build profile, and toolchain):