title: Add APK Signature Scheme v2 in gradle for ReactNative
body: <p>Google Play reject my react native app with error:
  <code>
  ERROR (Jar signer CERT.RSA): No APK Signature Scheme v2 signature from this signer ERROR (APK Signature Scheme v2 signer #0): No JAR signature from this signer.
  </code>
  It's look like a need to sign my app with v2 scheme but offical site have only manual for v1 scheme (<a href="https://facebook.github.io/react-native/docs/signed-apk-android.html" rel="nofollow noreferrer">https://facebook.github.io/react-native/docs/signed-apk-android.html</a>) and it's not enough for google play.</p>
  
  <p>How can I sign my react native app with v2 scheme?</p>