Update README.md

Author: gkorland

README.md

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 # redisgraph-go
 [![Forum](https://img.shields.io/badge/Forum-RedisGraph-blue)](https://forum.redislabs.com/c/modules/redisgraph)
-[![Gitter](https://badges.gitter.im/RedisLabs/RedisGraph.svg)](https://gitter.im/RedisLabs/RedisGraph?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge)
+[![Discord](https://img.shields.io/discord/697882427875393627?style=flat-square)](https://discord.gg/gWBRT6P)
 
 `redisgraph-go` is a Golang client for the [RedisGraph](https://oss.redislabs.com/redisgraph/) module. It relies on [`redigo`](https://github.com/gomodule/redigo) for Redis connection management and provides support for RedisGraph's QUERY, EXPLAIN, and DELETE commands.