Update non-maintenance message

README.md

@@ -2,7 +2,7 @@
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-**! Please note: This work is deprecated and will not be continued at least in the near future. Nevertheless, everyone is welcome to contribute to this work.**
+**PLEASE NOTE: This repo is currently not maintained.**
 
 This repo builds the SD card image with HypriotOS for the ODROID C2 ARM 64bit board. To build this SD card image we have to