Adjust description as ES7 features already came out.
Adjust description as ES7 features already came out.

The ES7(ES2016) **DO** only has two features: Array.prototype.includes & ** operator.
As [Function Bind Syntax](https://github.com/tc39/ecma262/blob/master/stage0.md) is still a stage 0 proposal, it not proper to regard it as a ES7 feature. (Seems at least ES9).

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