review: use proper github md

Author: hendrywiranto

README.md

@@ -1,8 +1,9 @@
 Testify - Thou Shalt Write Tests
 ================================
 
-Notice about Testify V2:
-It won't happen due to various reasons. You can read more about it on the maintainer's manifesto [here](https://github.com/stretchr/testify/issues/1089#issuecomment-1812734472).
+> [!NOTE]
+> Testify is being maintained at v1, no breaking changes will be accepted in this repo.  
+> [See discussion about v2](https://github.com/stretchr/testify/discussions/1560).
 
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