Add changelog for 2025-03-15 (#258)

* Add changelog for 2025-03-14

* Add changelog for 2025-03-15

Author: quantstruct-bot

fern/changelog/2025-03-14.mdx

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+## Blocks Schema Deprecations, Scheduling Enhancements, and New Voice Options for Vapi Voice
+
+
+2. **'scheduled' Status Added to Calls and Messages**: You can now set the status of a call or message to `scheduled`, allowing it to be executed at a future time. This enables scheduling functionality within your application for calls and messages.
+
+3. **New Voice Options for Text-to-Speech**: Four new voices—`Neha`, `Cole`, `Harry`, and `Paige`—have been added for text-to-speech services. You can enhance user experience by setting the `voiceId` to one of these options in your configurations.
+
+3. **Removal of Step and Block Schemas**:
+<Warning>Blocks and Steps are now officially deprecated. Developers should update their applications to adapt to these changes, possibly by using new or alternative schemas provided.</Warning>

fern/changelog/2025-03-15.mdx

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+# Enhancements in Assistant Responses, New Gemini Model, and Call Handling
+
+1. **Introduction of 'gemini-2.0-flash-lite' Model Option**: You can now use `gemini-2.0-flash-lite` in [`Assistant.model[provider="google"].model[model="gemini-2.0-flash-lite"]`](https://api.vapi.ai/api#:~:text=GoogleModel) for a reduced latency, lower cost Gemini model with a 1 million token context window.
+
+<Frame caption="gemini-2.0-flash-lite Model Option">
+    <img src="../static/images/changelog/gemini-2.0-flash-lite.png" alt="gemini-2.0-flash-lite Model Option" />
+</Frame>
+
+2. **New Assistant Paginated Response**: All [`Assistant`](https://api.vapi.ai/api#:~:text=Assistants) endpoints now return paginated responses. Each response specifies `itemsPerPage`, `totalItems`, and `currentPage`, which you can use to navigate through a list of assistants.