update README for 3.x (#1840)
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UglifyJS
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========
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UglifyJS 3
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==========
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[](https://travis-ci.org/mishoo/UglifyJS2)
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UglifyJS is a JavaScript parser, minifier, compressor or beautifier toolkit.
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#### Note:
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- `uglify-js 3.x` is incompatible with the [`2.x` branch](https://github.com/mishoo/UglifyJS2/tree/v2.x).
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- release versions of `uglify-js` only support ECMAScript 5 (ES5). If you wish to minify
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- **`uglify-js@3.x` has a new API and CLI and is not backwards compatible with [`uglify-js@2.x`](https://github.com/mishoo/UglifyJS2/tree/v2.x)**.
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- **Documentation for UglifyJS `2.x` releases can be found [here](https://github.com/mishoo/UglifyJS2/tree/v2.x)**.
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- Release versions of `uglify-js` only support ECMAScript 5 (ES5). If you wish to minify
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ES2015+ (ES6+) code then please use the [harmony](#harmony) development branch.
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- Node 7 has a known performance regression and runs `uglify-js` twice as slow.
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