Update README.md

Link to the legacy release has been removed (although still available).

README.md

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 International US QWERTY layout with AltGr (Right Alt) dead keys via AutoHotkey (Win), MSKLC (Win) and XKB/Xmodmap + .XCompose (Linux). This layout has borrowed some aspects from EurKEY (by Steffen Brüntjen).
 
 **Official release :** [![GitHub Release](https://img.shields.io/github/release/pieter-degroote/UltimateKEYS.svg)](https://github.com/pieter-degroote/UltimateKEYS/releases)  
-**Testing release :** [![GitHub Testing](https://img.shields.io/github/release/pieter-degroote/UltimateKEYS-testing.svg?label=testing)](https://github.com/pieter-degroote/UltimateKEYS-testing/releases)  
-**Legacy release :** [![GitHub Legacy](https://img.shields.io/github/release/pieter-degroote/UltimateKEYS-legacy.svg?label=legacy)](https://github.com/pieter-degroote/UltimateKEYS-legacy/releases)
+**Testing release :** [![GitHub Testing](https://img.shields.io/github/release/pieter-degroote/UltimateKEYS-testing.svg?label=testing)](https://github.com/pieter-degroote/UltimateKEYS-testing/releases)
 
 ## Keyboard Layout Image