Remove wake-on-boot argument parsing causing errors

[ryanjdillon]

Problem

I could not set the WIFI ssid or password after flashing the firmware on my LoPy4, as the updater script would fail when it attempted to handle an argument that was commented out.

Solution

• Remove handling of wob argument that caused errors in script.
• Add a a pip requirements file to specify the requirement on pyserial
• Add a brief README to assist others with script usage