Update README.md (#427)

README.md

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 # Ember Language Server
 
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+> [!IMPORTANT]  
+> This fork now merged to official language server, so, for actual codebase look at [ember-tooling/ember-language-server](https://github.com/ember-tooling/ember-language-server)
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 [![Greenkeeper badge](https://badges.greenkeeper.io/lifeart/ember-language-server.svg)](https://greenkeeper.io/)
 
 The Ember Language Server (ELS) implements the [Language Server Protocol](https://github.com/Microsoft/language-server-protocol) for Ember.js projects. ELS enables editors to provide features like auto complete, goto definition and diagnostics. To get these features, you have to install the plugin for your editor.