Update status + add contribution guidelines

README.md

@@ -1,7 +1,9 @@
 > **Note**
-> All `next-transpile-modules` features have natively landed to Next.js 13.1, you can check [the migration guide here](https://github.com/martpie/next-transpile-modules/releases/tag/the-end). 
-> 
-> This package is now officially deprecated, and the repository will be archived soon, thank you everyone!
+> All `next-transpile-modules` features have natively landed to Next.js 13.1, you can check [the migration guide here](https://github.com/martpie/next-transpile-modules/releases/tag/the-end).
+>
+> This package is now officially deprecated and on life-support.
+>
+> PRs with fixes are welcome and I will help review them, but that's it. I **highly** recommend contributing to Next.js in case your setup is not working there.
 
 ---
 
@@ -41,7 +43,7 @@ What this plugin **does not aim** to solve:
 | Next.js 8 / 9     | 2.x                |
 | Next.js 6 / 7     | 1.x                |
 
-Last Next.js version tested: **13.0.4**.
+Latest Next.js version tested: **13.4.12**.
 
 ## Installation
 
@@ -202,6 +204,21 @@ export default function MyApp({ Component, pageProps }) {
 }
 ```
 
+## Contributing
+
+- clone
+- `cd next-transpile-modules`
+- `yarn`
+
+If you want to update the Next.js tested version:
+
+- update `scripts/next-update.sh` with the latest Next.js version
+- make sure `npm`, `yarn` and `pnpm` are installed
+- `yarn setup`
+- `bash scripts/next-update.sh`
+
+Push your changes and Github Actions will test everything as it should be.
+
 ## FAQ
 
 ### What is the difference with `@weco/next-plugin-transpile-modules`?