Update package.json

package.json

   "description": "React Native WebView component for iOS, Android, and Windows 10",
   "main": "index.js",
   "author": "Jamon Holmgren <jamon@infinite.red>",
+  "contributors": [
+    "Thibault Malbranche <malbranche.thibault@gmail.com>"
+  ],
   "version": "0.1.0",
   "homepage": "https://github.com/react-native-community/react-native-webview#readme",
   "scripts": {