docs: update README

Author: kazupon

README.md

@@ -8,8 +8,8 @@ Internationalization middleware & utilities for h3 (and therefore also for Nitro
 
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-> [!NOTE]
-> You’re viewing the main branch, which is developing for h3 v2. If you want to check h3 v1, please see the [v1 branch](https://github.com/intlify/h3/tree/v1)
+> [!IMPORTANT]
+> You’re viewing the legacy repository, which is developing for `@intlify/h3` v1. If you want to use later version of it, please access the [srvmid](https://github.com/intlify/srvmid/tree/main)
 
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