Add changelog for 2025-05-18 (#405)

Author: quantstruct-bot

fern/changelog/2025-05-16.mdx

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+# Strip Asterisks from Transcribed Text with `stripAsterisk` Formatter
+
+1. **New `stripAsterisk` Formatter in [FormatPlan](https://api.vapi.ai/api#:~:text=FormatPlan)**: You can now remove asterisks from transcribed text by adding it to your `Assistant.voice[VOICE_PROVIDER].chunkPlan.formatPlan.formattersEnabled` configuration.
+
+<Info>
+Ensure `Assistant.voice[VOICE_PROVIDER].chunkPlan.formatPlan.enabled` is set to `true` to use the `stripAsterisk` formatter.
+</Info>