Remove gitter from README.md

README.md

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 [![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.