message: docs: update readme with new next.js versions tested
diff: ![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-9.5.5%20|%2010.2.2-blue)
  +![Tested Next.js versions](https://img.shields.io/badge/tested%20next.js%20versions-10.2.3%20|%2011.x-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)
  -A zero configuration Next.js 9/10 [serverless component](https://github.com/serverless-components/) for AWS Lambda@Edge aiming for full feature parity.
  +A zero configuration Next.js 10/11 [serverless component](https://github.com/serverless-components/) for AWS Lambda@Edge aiming for full feature parity.
  Please review [features](https://github.com/serverless-nextjs/serverless-next.js#features) for a list of currently supported features.
  