* Update Expo support state in README

* Update README.md

Hello, in order to use react-native-webview > 6.0.2 please make your android/gradle.properties contains:
```
android.useAndroidX=true
android.enableJetifier=true
```
This enables AndroidX libraries which are the new standard.

fixes #580 
fixes #581 
fixes #582

* docs: update README.md

* docs: update .all-contributorsrc

* docs: update README.md

* docs: update .all-contributorsrc

* docs: update README.md

* docs: update .all-contributorsrc

fixes #466 #194

* feat(android): fix overflow issues and match iOS default render error and loading behaviour

* Use babel preset typescript through react-native instead of ts-jest

* Update yarn.lock

* Update README.md

Adds @svbutko as a contributor for doc.

This was requested by Titozzz [in this comment](https://github.com/react-native-community/react-native-webview/pull/442#issuecomment-475252579)

* docs: update README.md

* docs: update .all-contributorsrc

The link was missing in the README for the getting started page, the square brackets were there though so looks like whoever wrote it just forgot to put the link there.

* chore(docs): Updated readme.md

* Update README.md

* Update README.md

Adds @jeluard as a contributor for doc.

This was requested by Titozzz [in this comment](https://github.com/react-native-community/react-native-webview/pull/347#issuecomment-463999246)

* docs: update README.md

* docs: update .all-contributorsrc

* docs: update README.md

* docs: update .all-contributorsrc

Adds @MalcolmScruggs as a contributor for code, tool, test.

This was requested by Titozzz [in this comment](https://github.com/react-native-community/react-native-webview/pull/293#issuecomment-460077647)

* docs: update README.md

* docs: update .all-contributorsrc

Just a minor correction of the anchor link in Readme file.

Adds @YangXiaomei as a contributor for code, doc.

This was requested by Titozzz [in this comment](https://github.com/react-native-community/react-native-webview/pull/265#issuecomment-456327682)

Adds @smathson as a contributor for code, doc.

This was requested by Titozzz [in this comment](https://github.com/react-native-community/react-native-webview/pull/203#issuecomment-455618880)

Adds @Salakar as a contributor for code, review, ideas, tool.

This was requested by Titozzz [in this comment](https://github.com/react-native-community/react-native-webview/pull/164#issuecomment-455618092)

* docs: update README.md

* docs: update .all-contributorsrc

* docs: update README.md

* docs: update .all-contributorsrc

* Update .all-contributorsrc

Adds @titozzz as a contributor for code, ideas, review, maintenance, test, doc, infra.

This was requested by Titozzz [in this comment](https://github.com/react-native-community/react-native-webview/pull/253#issuecomment-455609852)

Adds a testimonial from Garrett McCollough (with his permission) to the README.

Added a Contributing.md file and moved contributor notes there. Also added @empyrical. :tada:

* Add fix for keyboard dismiss leaving viewport shifted in iOS 12

* Readme - added note about Expo and added troubleshooting section

* Added the onLoadProgress property to the iOS wkwebview and Android webview