Fix demo links from zksync.js
# zkSync: scaling and privacy engine for Ethereum
-Check out [zkSync live demo](https://demo.matter-labs.io/).
+
+[![Live on Mainnet](https://img.shields.io/badge/wallet-Live%20on%20Mainnet-blue)](https://wallet.zksync.io)
+[![Live on Rinkeby](https://img.shields.io/badge/wallet-Live%20on%20Rinkeby-blue)](https://rinkeby.zksync.io)
+[![Live on Ropsten](https://img.shields.io/badge/wallet-Live%20on%20Ropsten-blue)](https://ropsten.zksync.io)
+[![Join the technical discussion chat at https://gitter.im/matter-labs/zksync](https://badges.gitter.im/matter-labs/zksync.svg)](https://gitter.im/matter-labs/zksync?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
zkSync is a scaling and privacy engine for Ethereum. Its current functionality scope includes low gas transfers of ETH and ERC20 tokens in the Ethereum network. This document is a description of the JS library that can be used to interact with zkSync.
