readme: document t8n tool versions used in eip-specific branches (#288)

README.md

@@ -64,6 +64,13 @@ The following transition tools are supported by the framework:
 | [hyperledger/besu](https://github.com/hyperledger/besu/tree/main/ethereum/evmtool) | [`evm t8n-server`](https://github.com/hyperledger/besu/tree/main/ethereum/evmtool) | No |
 | [status-im/nimbus-eth1](https://github.com/status-im/nimbus-eth1) | [`t8n`](https://github.com/status-im/nimbus-eth1/blob/master/tools/t8n/readme.md) | Yes |
 
+### Upcoming EIP Development
+
+Generally, specific `t8n` implementations and branches must be used when developing tests for upcoming EIPs (last updated 2023-09-07):
+
+- Cancun related EIPs (4844, 4788, 1153, 6780) - [marioevz/go-ethereum@cancun-t8n](https://github.com/marioevz/go-ethereum/tree/cancun-t8n)
+- EOF tests - [ethereum/evmone@master](https://github.com/ethereum/evmone)
+
 ## Getting Started
 
 ### Prerequisites