v0.0.18

What's Changed

• Add file processing example by @eyurtsev in https://github.com/langchain-ai/langserve/pull/113
• Add working with files to README.md by @eyurtsev in https://github.com/langchain-ai/langserve/pull/114
• Add a custom user type by @eyurtsev in https://github.com/langchain-ai/langserve/pull/115
• Widgets by @eyurtsev in https://github.com/langchain-ai/langserve/pull/91
• Bump version by @eyurtsev in https://github.com/langchain-ai/langserve/pull/116

Full Changelog: https://github.com/langchain-ai/langserve/compare/v0.0.17...v0.0.18