chore: remove the FIXME comment on outDir field

Starting in TypeScript 5.6, `.tsbuildinfo` file is always written in a
`--build` invocation[^1].
So the entire community need to embrace the new behavior and explicitly
set `tsbuildInfoFile` if they want to avoid polluting the project root.

So I think it's no longer our responsibility to find a workaround for
the users.

Closes #27

[^1]: https://devblogs.microsoft.com/typescript/announcing-typescript-5-6-beta/#tsbuildinfo-is-always-written

README.md

@@ -4,7 +4,7 @@ TSConfigs for Vue projects to extend.
 
 Requires TypeScript >= 5.0. For TypeScript v4.5 to v4.9, please use [v0.1.x](https://www.npmjs.com/package/@vue/tsconfig/v/0.1.3).
 
-[See below for the changes in v0.3.x.](#migrating-from-typescript--50)
+[See below for the breaking changes in v0.3.x.](#migrating-from-typescript--50)
 
 ## Installation
 

tsconfig.json

@@ -3,16 +3,6 @@
     // Most non-library projects don't need to emit declarations.
     // So we add this option by default to make the config more friendly to most users.
     "noEmit": true,
-    // When type-checking with solution-style tsconfigs, though with `noEmit: true`, there won't
-    // be any `.d.ts` files emitted, but tsc still writes a `.tsbuildinfo` file to the `outDir`
-    // for each project. If we don't explicitly set the `outDir`, it will be in the same folder
-    // as the `tsconfig.json` file, which would look messy.
-    // Setting it to `./dist/` isn't ideal either, because it would pollute the `dist` folder.
-    // So we set it to a hidden folder in `node_modules` to avoid polluting the project root.
-    // FIXME:
-    // This caused a regression: https://github.com/vuejs/tsconfig/issues/27
-    // Need to find a better solution.
-    // "outDir": "./node_modules/.cache/vue-tsbuildinfo",
 
     // As long as you are using a build tool, we recommend you to author and ship in ES modules.
     // Even if you are targeting Node.js, because