What's Changed
* Fix async task being destroyed before cancelled by nfcampos in https://github.com/hwchase17/langchain/pull/2787
* agent memory by hwchase17 in https://github.com/hwchase17/langchain/pull/2792
* Harrison/gpt cache by hwchase17 in https://github.com/hwchase17/langchain/pull/2744
* fix typo in prompt by dev2049 in https://github.com/hwchase17/langchain/pull/2797
* Weaviate attributes and error handling by kahkeng in https://github.com/hwchase17/langchain/pull/2800
* Improve eval chain prompt by dev2049 in https://github.com/hwchase17/langchain/pull/2798
* Fixed k=0 bug on ConversationBufferWindowMemory by timconnorz in https://github.com/hwchase17/langchain/pull/2796
* feat: add support for non-html in `UnstructuredURLLoader` by MthwRobinson in https://github.com/hwchase17/langchain/pull/2793
* Add max_execution_time to openapi, pandas, and sql creators by zachdj in https://github.com/hwchase17/langchain/pull/2779
* agent refactor by hwchase17 in https://github.com/hwchase17/langchain/pull/2801
* Harrison/comet ml by hwchase17 in https://github.com/hwchase17/langchain/pull/2799
* Return output of PythonAstREPLTool when falling back to exec() by kulltc in https://github.com/hwchase17/langchain/pull/2780
* Update README.md by nuhmanpk in https://github.com/hwchase17/langchain/pull/2805
* Add BiliBiliLoader to langchain.document_loaders.__init__.py by liaokongVFX in https://github.com/hwchase17/langchain/pull/2826
* Fix headings in docs (ClearML and Comet) by preeteshjain in https://github.com/hwchase17/langchain/pull/2808
* bump version to 139 by hwchase17 in https://github.com/hwchase17/langchain/pull/2834
New Contributors
* dev2049 made their first contribution in https://github.com/hwchase17/langchain/pull/2797
* timconnorz made their first contribution in https://github.com/hwchase17/langchain/pull/2796
* kulltc made their first contribution in https://github.com/hwchase17/langchain/pull/2780
* preeteshjain made their first contribution in https://github.com/hwchase17/langchain/pull/2808
**Full Changelog**: https://github.com/hwchase17/langchain/compare/v0.0.138...v0.0.139