Add changelog for January 07, 2025 (#137)

Co-authored-by: quantstruct[bot] <190039098+quantstruct[bot]@users.noreply.github.com>

Author: quantstruct[bot]

fern/changelog/2025-01-07.mdx

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+# New Gemini 2.0 Models, Realtime Updates, and Configuration Options
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+1. **New Gemini 2.0 Models**: You can now use two new models in `Assistant.model[model='GoogleModel']`: `gemini-2.0-flash-exp` and `gemini-2.0-flash-realtime-exp`, which give you access to the latest  real-time capabilities and experimental features.
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+2. **Support for Real-time Configuration with Gemini 2.0 Models**: Developers can now fine-tune real-time settings for the Gemini 2.0 Multimodal Live API using `Assistant.model[model='GoogleModel'].realtimeConfig`, enabling more control over text generation and speech output.
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+3. **Customize Speech Output for Gemini Multimodal Live APIs**: You can now customize the assistant's voice using the `speechConfig` and `voiceConfig` properties, with options like `"Puck"`, `"Charon"`, and more.
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+4. **Advanced Gemini Text Generation Parameters**: You can also tune advanced hyperparameters such as `topK`, `topP`, `presencePenalty`, and `frequencyPenalty` to control how the assistant generates responses, leading to more natural and dynamic conversations.