BREAKING CHANGE:
This release introduces the `setSupportMultipleWindows` prop for Android. This sets the underlying Android WebView setting `setSupportMultipleWindows`. This prop defaults to `true` (previously `false`), and serves to mitigate the security advisory [CVE-2020-6506](https://github.com/react-native-webview/react-native-webview/security/advisories/GHSA-36j3-xxf7-4pqg).
The primary way this new behavior changes existing React Native WebView implementations on Android is that links that open in new tabs/windows (such as `<a target="_blank">`) will now prompt to open in the system browser, rather than re-using the current WebView.
If this behavior is not desirable, you can set this new prop to `false`, but be aware that this exposes your app to the security vulnerability listed above. Make sure you have read and understand the whole advisory and relevant links.
iOS & Windows are unaffected.
```jsx
<WebView
// ...
setSupportMultipleWindows={true} // default: true
/>
```
Thanks to @mrcoinbase, @kelset, and @Titozzz for their work on this.
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