docs: update next.js version tested

Author: dphang

README.md

@@ -11,7 +11,7 @@
 ![End-to-end Tests](https://github.com/serverless-nextjs/serverless-next.js/workflows/End-to-end%20Tests/badge.svg)
 [![Codacy Badge](https://app.codacy.com/project/badge/Grade/c0d3aa2a86cb4ce98772a02015f46314)](https://www.codacy.com/manual/danielcondemarin/serverless-nextjs/dashboard?utm_source=github.com&utm_medium=referral&utm_content=serverless-nextjs/serverless-next.js&utm_campaign=Badge_Grade)
 [![codecov](https://codecov.io/gh/serverless-nextjs/serverless-next.js/branch/master/graph/badge.svg)](https://codecov.io/gh/serverless-nextjs/serverless-next.js)
-![Tested Next.js versions](https://img.shields.io/badge/tested%20next.js%20versions-9.5.x%20%7C%2010.0.x-blue)
+![Tested Next.js versions](https://img.shields.io/badge/tested%20next.js%20versions-10.2.2-blue)
 [![Cypress.io](https://img.shields.io/badge/tested%20with-Cypress-04C38E.svg)](https://www.cypress.io/)
 ![Platforms](https://img.shields.io/badge/platforms-aws-blue)