Migration Readme: fix rule name.

Author: Anna Bocharova

migration/README.md

@@ -18,6 +18,6 @@ import migration from "@express-zod-api/migration";
 
 export default [
   { languageOptions: { parser }, plugins: { migration } },
-  { files: ["**/*.ts"], rules: { "migration/v24": "error" } },
+  { files: ["**/*.ts"], rules: { "migration/v25": "error" } },
 ];
 ```