chore(release): 2.8.0 [skip ci]

# [2.8.0](https://github.com/react-native-community/react-native-webview/compare/v2.7.1...v2.8.0) (2018-11-19)

### Features

* **WKWebview:** Add fix for keyboard dismiss leaving viewport shifted in iOS 12 ([#134](https://github.com/react-native-community/react-native-webview/issues/134)) ([5425039](https://github.com/react-native-community/react-native-webview/commit/5425039))

package.json

     "Thibault Malbranche <malbranche.thibault@gmail.com>"
   ],
   "license": "MIT",
-  "version": "2.7.1",
+  "version": "2.8.0",
   "homepage": "https://github.com/react-native-community/react-native-webview#readme",
   "scripts": {
     "test:ios:flow": "flow check",