Update README.md

Updated JSON element to disable lang-server

Author: cwu-umd

README.md

@@ -18,7 +18,7 @@ This extension adds support for [Racket](http://www.racket-lang.org) to VS Code.
     raco pkg update racket-langserver
     ```
 
-    If don't want to use the lang-server at all, you don't have to. Just set `"magic-racket.lsp.enabled": false` in your configuration file. But note that if you do so, you won't get the “smart” features like autocomplete, formatting, etc.
+    If don't want to use the lang-server at all, you don't have to. Just set `"magicRacket.languageServer.enabled": false` in your configuration file. But note that if you do so, you won't get the “smart” features like autocomplete, formatting, etc.
 4. If you are running VSCode on WSL or a headless Linux server, please see the Troubleshooting section below.
 
 ## Features