update discord link

README.md

@@ -7,7 +7,7 @@ Binance Smart Chain starts its development based on go-ethereum fork. So you may
 [![API Reference](
 https://camo.githubusercontent.com/915b7be44ada53c290eb157634330494ebe3e30a/68747470733a2f2f676f646f632e6f72672f6769746875622e636f6d2f676f6c616e672f6764646f3f7374617475732e737667
 )](https://pkg.go.dev/github.com/ethereum/go-ethereum?tab=doc)
-[![Discord](https://img.shields.io/badge/discord-join%20chat-blue.svg)](https://discord.gg/T3Ka4V4N)
+[![Discord](https://img.shields.io/badge/discord-join%20chat-blue.svg)](https://discord.gg/5Z3C3SdxDw)
 
 But from that baseline of EVM compatible, Binance Smart Chain introduces  a system of 21 validators with Proof of Staked Authority (PoSA) consensus that can support short block time and lower fees. The most bonded validator candidates of staking will become validators and produce blocks. The double-sign detection and other slashing logic guarantee security, stability, and chain finality.