Update README.md (#303)

Added arbitrum goerli testnet

Author: iflp

packages/multicall/README.md

@@ -146,5 +146,6 @@ The utility contract is `0xCa731e0f33Afbcfa9363d6F7449d1f5447d10C80`, it has bee
 | Mumbai (Matic testnet) | 0xd130B43062D875a4B7aF3f8fc036Bc6e9D3E1B3E | Yes      |
 | Arbitrum               | 0xd130B43062D875a4B7aF3f8fc036Bc6e9D3E1B3E | Yes      |
 | Arbitrum testnet       | 0xd130B43062D875a4B7aF3f8fc036Bc6e9D3E1B3E | Yes      |
+| Arbitrum Görli testnet | 0xd130B43062D875a4B7aF3f8fc036Bc6e9D3E1B3E | Yes      |
 
 It can be deployed on any network that supports the `CREATE2` opcode.