Langchain-mcp-tools

Changed
- Update the dependencies, esp. `Updated mcp v1.2.0 -> v1.6.0` (this fixes Issue 22)
- Add `cwd` to `server_config` to specify the working directory for the MCP server to use
- Add `stderr` to specify a filedescriptor to which MCP server's stderr is redirected
- Rename `examples/example.py` to `testfiles/simple-usage.py` to avoid confusion

Changed
- Make the logger fallback to a pre-configured logger if no root handlers exist
- Remove unnecessarily added python-dotenv from the dependencies
- Minor updates to README.me

Changed
- Update LLM models used in example.py

Fixed
- [PR 14](https://github.com/hideya/langchain-mcp-tools-py/pull/14): Fix: Handle JSON Schema type: ["string", "null"] for Notion MCP tools

Changed
- Minor updates to README.me and example.py

Fixed
- [Issue 11](https://github.com/hideya/langchain-mcp-tools-py/issues/11): Move some dev dependencies which are mistakenly in dependencies to the right section

Added
- `make test-publish` target to handle publication more carefully

Changed
- Estimate the size of returning text in a simpler way
- Return a text with reasonable explanation when no text return found