chore(release): 6.7.0 [skip ci]

# [6.7.0](https://github.com/react-native-community/react-native-webview/compare/v6.6.0...v6.7.0) (2019-08-04)

### Features

* **injectedJavaScript:** Error replaced by warnings, and callback runs ([3baebf8](https://github.com/react-native-community/react-native-webview/commit/3baebf8))

package.json

     "Thibault Malbranche <malbranche.thibault@gmail.com>"
   ],
   "license": "MIT",
-  "version": "6.6.0",
+  "version": "6.7.0",
   "homepage": "https://github.com/react-native-community/react-native-webview#readme",
   "scripts": {
     "ci": "CI=true && yarn lint && yarn test",