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)