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Update README.md

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`@@ -43,6 +43,7 @@ npm start`
`43`	`43`	```
`44`	`44`	`to start node server.`
`45`	`45`	`If you've already started rails app, then node will ask you to change its default port (:3000) to some random port, just hit enter and node will do the magic.`
	`46`	`+`
`46`	`47`	`Client and server can talk even though they're at different domains(ports in this case). This is possible because of Rack CORS Middleware. Rack::Cors provides support for Cross-Origin Resource Sharing (CORS) for Rack compatible web applications. For this example I enabled requests from any domain, but it's definitely not recommended for production!`
`47`	`48`
`48`	`49`	`<h4>Option #2: Server-side rendering</h4>`

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