Update README.md

A note added on loss of Raspian OS support

Author: ArmanTheParman

README.md

@@ -22,3 +22,8 @@ I can not gaurantee that as newer versions of Electrum are released that the sam
 
 I have also included other useful files that I usually add to my Pi Zero systems.
 Ian coleman's BIP 39 tool (you can just get this directly from his GitHub page as an alternative.
+
+IMPORTANT ADDITION:
+With new updates to the Raspian OS, The Pi Zero peforms poorly (Raspberry PI is no longer supporting this device).
+You should download the latest "Buster" version of the operating system, and also, you can't use the latest version
+of Electrum either, as it requires a later Python version. Find the older 2021 versions of Electrum to use.