Quick fix for Android native app back button :)

Oh, and the Android app is out, go check it out! https://play.google.com/store/apps/details?id=app.vger.voyager

What's Changed

• Add app badges to README.md by @aeharding in https://github.com/aeharding/voyager/pull/585
• Fix back button on last route not exiting the app on Android by @aeharding in https://github.com/aeharding/voyager/pull/590

Full Changelog: https://github.com/aeharding/voyager/compare/1.3.0...1.3.1