Update README.md

Author: NicoKiaru

README.md

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-# ABBA should be used with **QuPath 0.4.4**
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-> [!WARNING]  
-> ABBA should be used with **QuPath 0.4.4** (or above). If you are using QuPath 0.4.0, 0.4.1, 0.4.2 or 0.4.3 you NEED TO UPDATE IT!
-
 # QuPath ABBA extension
 
 This repo adds some support for the [ABBA plugin](https://biop.github.io/ijp-imagetoatlas/) in QuPath.