Update README.md

PowerBroker2 · Jul 22, 2020 · 2a56dc8 · 2a56dc8
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@@ -39,3 +39,7 @@ See the [example sketches](https://github.com/PowerBroker2/SerialTransfer/tree/m
 
 - datum = tx/rx a single object
 - data = tx/rx multiple objects
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+# ***NOTE:***
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+SPITransfer.h and it's associated features are not supported for the Arduino Nano 33 BLE or DUE.