Replace deprecated 'compile' gradle configuration with 'implementation' (#518)
Replace deprecated 'compile' gradle configuration with 'implementation' (#518)

* Replace deprecated 'compile' gradle configuration with 'implementation'

According to [ReactNative@0.57](https://github.com/react-native-community/react-native-releases/blob/master/CHANGELOG.md#057) default gradle version is now `4.4`.

* Fixed spelling

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