[Bug] Redisson below version 3.2 is not supported and there is no writeBehindService implementation.

### Search before asking

- [x] I have searched the existing [issues](https://github.com/arextest/arex-agent-java/issues) before asking.

### AREX Test Service

AREX Java Agent (arextest/arex-agent-java)

### Current Behavior

Redisson below version 3.2 is not supported and there is no writeBehindService implementation.

### Expected Behavior

update readme

### Steps To Reproduce

update readme

### Anything else

_No response_

### Are you willing to submit a pull request to fix on your own?

- [ ] Yes I am willing to submit a pull request on my own!

Start by locating the repository README and compare its Redisson version support and write-behind documentation with the issue statement. Update the README to address both points, then review the rendered text for accuracy; no test file or other entry point is mentioned.

Written by the indexing model from the issue text.