Promote pieeprom-2020-09-03 to STABLE

Author: timg236

firmware/release-notes.md

@@ -1,8 +1,10 @@
 # Raspberry Pi4 bootloader EEPROM release notes
 
-USB MSD boot also requires updated beta GPU firmware. Please read
+USB MSD boot also requires the firmware from Raspberry Pi OS 2020-08-20 or newer.
 https://www.raspberrypi.org/documentation/hardware/raspberrypi/bcm2711_bootloader_config.md
 
+## 2020-09-07 Promote 2020-09-03 to release to STABLE
+
 ## 2020-09-03 Only use green LED for error status in bootloader - BETA
    * Turn the green LED on and leave it on unless an error code occurs.
      Previously, SD activity was displayed but that plus muxing with the