v0.39.0

• react-native-sentry >= 0.39.0 requires react-native >= 0.56.0
• [Android] Bumping of gradle deps

compileSdkVersion 26
buildToolsVersion '26.0.3'
...
targetSdkVersion 26

• [Android] Use sentry-android 1.7.5
• Bump @sentry/wizard 0.11.0
• Bump sentry-cocoa 4.1.0
• Use new SDK identifier sentry.javascript.react-native