Update README.md

Author: sheetalkamat

README.md

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 This extension is deprecated, use JavaScript and TypeScript Nightly extension at https://marketplace.visualstudio.com/items?itemName=ms-vscode.vscode-typescript-next instead.
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-## The Beta Version of the TypeScript Grammar 
- 
-We use this extension to distribute the Beta version of our new TypeScript grammar. Please file
-any issues you find against https://github.com/Microsoft/TypeScript-TmLanguage
- 
-### License
-The extension is made available under the following [Microsoft Software License Terms](LICENSE.txt).
-