Add changelog for January 22, 2025 (#168)

Author: quantstruct-bot

fern/changelog/2025-01-22.mdx

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+# Tool Calling Updates, Final Transcripts, and DeepSeek Reasoner
+1. **Migrate `ToolCallFunction` to `ToolCall`**: You should update your client and server tool calling code to use the [`ToolCall` schema](https://api.vapi.ai/api#:~:text=ToolCall) instead of `ToolCallFunction`, which includes properties like `name`, `tool`, and `toolBody` for more detailed tool call specifications. ToolCallFunction has been removed.
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+2. **Include `ToolCall` Nodes in Workflows**: You can now incorporate [`ToolCall` nodes](https://api.vapi.ai/api#:~:text=ToolCall) directly into workflow block steps, enabling tools to be invoked as part of the workflow execution.
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+3. **New Model Option `deepseek-reasoner`**: You can now select `deepseek-reasoner` as a model option inside your assistants with `Assistant.model["deep-seek"].model["deepseek-reasoner"]`, offering enhanced reasoning capabilities for your applications.
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+4. **Support for Final Transcripts in Server Messages**: The API now supports `'transcript[transcriptType="final"]'` in server messages, allowing your application to handle and process end of conversation transcripts.