chore(release): 6.4.1 [skip ci]

## [6.4.1](https://github.com/react-native-community/react-native-webview/compare/v6.4.0...v6.4.1) (2019-08-02)

### Bug Fixes

* **android:** onMessage on android to return baseEvent([#755](https://github.com/react-native-community/react-native-webview/issues/755)) ([282f81d](https://github.com/react-native-community/react-native-webview/commit/282f81d))

package.json

     "Thibault Malbranche <malbranche.thibault@gmail.com>"
   ],
   "license": "MIT",
-  "version": "6.4.0",
+  "version": "6.4.1",
   "homepage": "https://github.com/react-native-community/react-native-webview#readme",
   "scripts": {
     "ci": "CI=true && yarn lint && yarn test",