chore(docs): add MalcolmScruggs as a contributor (#308)

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)

.all-contributorsrc

         "code",
         "doc"
       ]
+    },
+    {
+      "login": "MalcolmScruggs",
+      "name": "Malcolm Scruggs",
+      "avatar_url": "https://avatars1.githubusercontent.com/u/22333355?v=4",
+      "profile": "https://github.com/MalcolmScruggs",
+      "contributions": [
+        "code",
+        "tool",
+        "test"
+      ]
     }
   ],
   "contributorsPerLine": 7

README.md

 # React Native WebView - a Modern, Cross-Platform WebView for React Native
-[![star this repo](http://githubbadges.com/star.svg?user=react-native-community&repo=react-native-webview&style=flat)](https://github.com/react-native-community/react-native-webview) [![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg?style=flat-square)](http://makeapullrequest.com) [![All Contributors](https://img.shields.io/badge/all_contributors-7-orange.svg?style=flat-square)](#contributors) [![Known Vulnerabilities](https://snyk.io/test/github/react-native-community/react-native-webview/badge.svg?style=flat-square)](https://snyk.io/test/github/react-native-community/react-native-webview) 
+[![star this repo](http://githubbadges.com/star.svg?user=react-native-community&repo=react-native-webview&style=flat)](https://github.com/react-native-community/react-native-webview) [![PRs Welcome](https://img.shields.io/badge/PRs-welcome-brightgreen.svg?style=flat-square)](http://makeapullrequest.com) [![All Contributors](https://img.shields.io/badge/all_contributors-8-orange.svg?style=flat-square)](#contributors) [![Known Vulnerabilities](https://snyk.io/test/github/react-native-community/react-native-webview/badge.svg?style=flat-square)](https://snyk.io/test/github/react-native-community/react-native-webview) 
 
 **React Native WebView** is a modern, well-supported, and cross-platform WebView for React Native. It is intended to be a replacement for the built-in WebView (which will be [removed from core](https://github.com/react-native-community/discussions-and-proposals/pull/3)).
 
 <!-- prettier-ignore -->
 | [<img src="https://avatars1.githubusercontent.com/u/6181446?v=4" width="100px;" alt="Thibault Malbranche"/><br /><sub><b>Thibault Malbranche</b></sub>](https://twitter.com/titozzz)<br />[💻](https://github.com/react-native-community/react-native-webview/commits?author=titozzz "Code") [🤔](#ideas-titozzz "Ideas, Planning, & Feedback") [👀](#review-titozzz "Reviewed Pull Requests") [📖](https://github.com/react-native-community/react-native-webview/commits?author=titozzz "Documentation") [🚧](#maintenance-titozzz "Maintenance") [⚠️](https://github.com/react-native-community/react-native-webview/commits?author=titozzz "Tests") [🚇](#infra-titozzz "Infrastructure (Hosting, Build-Tools, etc)") [💬](#question-titozzz "Answering Questions") | [<img src="https://avatars3.githubusercontent.com/u/1479215?v=4" width="100px;" alt="Jamon Holmgren"/><br /><sub><b>Jamon Holmgren</b></sub>](https://jamonholmgren.com)<br />[💻](https://github.com/react-native-community/react-native-webview/commits?author=jamonholmgren "Code") [🤔](#ideas-jamonholmgren "Ideas, Planning, & Feedback") [👀](#review-jamonholmgren "Reviewed Pull Requests") [📖](https://github.com/react-native-community/react-native-webview/commits?author=jamonholmgren "Documentation") [🚧](#maintenance-jamonholmgren "Maintenance") [⚠️](https://github.com/react-native-community/react-native-webview/commits?author=jamonholmgren "Tests") [💡](#example-jamonholmgren "Examples") [💬](#question-jamonholmgren "Answering Questions") | [<img src="https://avatars1.githubusercontent.com/u/2570562?v=4" width="100px;" alt="Andrei Pfeiffer"/><br /><sub><b>Andrei Pfeiffer</b></sub>](https://github.com/andreipfeiffer)<br />[💻](https://github.com/react-native-community/react-native-webview/commits?author=andreipfeiffer "Code") [👀](#review-andreipfeiffer "Reviewed Pull Requests") [🤔](#ideas-andreipfeiffer "Ideas, Planning, & Feedback") | [<img src="https://avatars0.githubusercontent.com/u/5347038?v=4" width="100px;" alt="Michael Diarmid"/><br /><sub><b>Michael Diarmid</b></sub>](https://twitter.com/mikediarmid)<br />[💻](https://github.com/react-native-community/react-native-webview/commits?author=Salakar "Code") [👀](#review-Salakar "Reviewed Pull Requests") [🤔](#ideas-Salakar "Ideas, Planning, & Feedback") [🔧](#tool-Salakar "Tools") | [<img src="https://avatars3.githubusercontent.com/u/932981?v=4" width="100px;" alt="Scott Mathson"/><br /><sub><b>Scott Mathson</b></sub>](http://smathson.github.io)<br />[💻](https://github.com/react-native-community/react-native-webview/commits?author=smathson "Code") [📖](https://github.com/react-native-community/react-native-webview/commits?author=smathson "Documentation") | [<img src="https://avatars0.githubusercontent.com/u/8221990?v=4" width="100px;" alt="Margaret"/><br /><sub><b>Margaret</b></sub>](https://github.com/YangXiaomei)<br />[💻](https://github.com/react-native-community/react-native-webview/commits?author=YangXiaomei "Code") [📖](https://github.com/react-native-community/react-native-webview/commits?author=YangXiaomei "Documentation") | [<img src="https://avatars2.githubusercontent.com/u/1173161?v=4" width="100px;" alt="Jordan Sexton"/><br /><sub><b>Jordan Sexton</b></sub>](https://stylisted.com)<br />[💻](https://github.com/react-native-community/react-native-webview/commits?author=jordansexton "Code") [📖](https://github.com/react-native-community/react-native-webview/commits?author=jordansexton "Documentation") |
 | :---: | :---: | :---: | :---: | :---: | :---: | :---: |
+| [<img src="https://avatars1.githubusercontent.com/u/22333355?v=4" width="100px;" alt="Malcolm Scruggs"/><br /><sub><b>Malcolm Scruggs</b></sub>](https://github.com/MalcolmScruggs)<br />[💻](https://github.com/react-native-community/react-native-webview/commits?author=MalcolmScruggs "Code") [🔧](#tool-MalcolmScruggs "Tools") [⚠️](https://github.com/react-native-community/react-native-webview/commits?author=MalcolmScruggs "Tests") |
 <!-- ALL-CONTRIBUTORS-LIST:END -->
 
 This project follows the [all-contributors](https://github.com/all-contributors/all-contributors) specification. Contributions of any kind welcome!