fix(): Add Github badge

README.md

@@ -3,11 +3,14 @@
 
 [![App Store][app-store-badge]][app-store-url]
 [![Google Play][google-play-badge]][google-play-url]
+[![Github][github-badge]][github-url]
 
 [app-store-badge]: ./res/app-store-badge.png
 [app-store-url]: https://itunes.apple.com/us/app/parity-signer/id1218174838
 [google-play-badge]: ./res/google-play-badge.png
 [google-play-url]: https://play.google.com/store/apps/details?id=io.parity.signer
+[github-badge]: ./res/github-badge.png
+[github-url]: https://github.com/paritytech/parity-signer/releases/tag/v2.0-beta
 
 # Parity Signer - Turn your smartphone into a hardware wallet