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docs: mention puppeteer-core (#3061)

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README.md
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@ -39,6 +39,18 @@ npm i puppeteer
Note: When you install Puppeteer, it downloads a recent version of Chromium (~170Mb Mac, ~282Mb Linux, ~280Mb Win) that is guaranteed to work with the API. To skip the download, see [Environment variables](https://github.com/GoogleChrome/puppeteer/blob/v1.7.0/docs/api.md#environment-variables).
### puppeteer-core
Since version 1.7.0 we publish the [`puppeteer-core`](https://www.npmjs.com/package/puppeteer-core) package,
a version of Puppeteer that doesn't download Chromium by default.
```bash
npm i puppeteer-core
```
`puppeteer-core` is intended to be a lightweight version of puppeteer for launching an existing browser installation or for connecting to a remote one.
### Usage
Note: Puppeteer requires at least Node v6.4.0, but the examples below use async/await which is only supported in Node v7.6.0 or greater.

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docs/api.md
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@ -313,6 +313,8 @@ If puppeteer doesn't find them in the environment, a lowercased variant of these
- `PUPPETEER_DOWNLOAD_HOST` - overwrite host part of URL that is used to download Chromium
- `PUPPETEER_CHROMIUM_REVISION` - specify a certain version of chrome you'd like puppeteer to use during the installation step.
> **NOTE** PUPPETEER_* env variables are not accounted for in the [`puppeteer-core`](https://www.npmjs.com/package/puppeteer-core) package.
### Error handling
Puppeteer methods might throw errors if they are unable to fufill a request. For example, [page.waitForSelector(selector[, options])](#pagewaitforselectorselector-options)