Add warning about RPi4

Signed-off-by: Dieter Reuter <[email protected]>
DieterReuter · Jul 20, 2019 · 99334fa · 99334fa
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diff --git a/README.md b/README.md
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 # image-builder-rpi64
 [![Build Status](https://travis-ci.org/DieterReuter/image-builder-rpi64.svg?branch=master)](https://travis-ci.org/DieterReuter/image-builder-rpi64)
 
+**Warning:** This SD image will not work on a Raspberry Pi 4B !!! 
+
 This repo builds the SD card image with HypriotOS for the Raspberry Pi 3 in 64bit.
 You can find released versions of the SD card image here in the GitHub
 releases page. To build this SD card image we have to