langchain 0.1 support

[georgehu0815]

we need support langchian v0.1

[seven7-AI]

Updates on langchain

[Timothyxxx]

Could you check if #60 helpful?

[Timothyxxx]

We can continue on this pull request and support the new langchain

[github-actions]

This issue is stale because it has been open 3 days with no activity. Remove stale label or comment or this will be closed in 4 days.

[github-actions]

This issue was closed because it has been stalled for 4 days with no activity.