how to bundle-analyzer with next-compose-plugins (#15370)

Added a section in readme with the proper use of the plugin with next-compose-plugins ^2.0.0, otherwise it doesn't work

packages/next-bundle-analyzer/readme.md

@@ -41,3 +41,18 @@ ANALYZE=true yarn build
 ```
 
 When enabled two HTML files (client.html and server.html) will be outputted to `<distDir>/analyze/`. One will be for the server bundle, one for the browser bundle.
+
+### Usage with next-compose-plugins
+
+From version 2.0.0 of next-compose-plugins you need to call bundle-analyzer in this way to work
+
+```js
+const withPlugins = require('next-compose-plugins')
+const withBundleAnalyzer = require('@next/bundle-analyzer')({
+  enabled: process.env.ANALYZE === 'true',
+})
+module.exports = withPlugins([
+  [withBundleAnalyzer({})],
+  // your other plugins here
+])
+```