Bump OS to 0.3.1

Author: jonathanpallant

src/thumbv6m-none-eabi-flash1002-libneotron_os.bin

@@ -1,6 +1,6 @@
-This is Neotron OS version v0.3.0
+This is Neotron OS version v0.3.1
 
-Taken from https://github.com/Neotron-Compute/Neotron-OS/releases/tag/v0.3.0
+Taken from https://github.com/Neotron-Compute/Neotron-OS/releases/tag/v0.3.1
 
 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by