add alternative to hotfix (not used but may be useful info for otheres)

README.md

@@ -172,6 +172,9 @@ Errata for V1.0
     want to support more current.
   - **Proper fix for new revision**: Add the resistors to the PCB. Maybe add the full 4.5 mV to
     be on the safe side and consider adjusting gain.
+  - Alternative: No fix. The 2k measurement mode won't work but it is optional anyway. Current
+    measurement while the main MOSFET is on will be off by up to 45 mA but more like 10 mA in
+    practice.
 
 ### Planned changes before deploying the boards