Update changelogs from fern repo (#878)

Co-authored-by: Swimburger <[email protected]>

Author: fern-support

fern/products/sdks/overview/typescript/changelog/2025-09-18.mdx

@@ -0,0 +1,10 @@
+## 3.0.0
+**`(feat):`** Change defaults configuration in _generators.yml_ to use pnpm package manager and vitest test framework.
+To avoid breaking changes, explicitly set the options above with the `Before` values in the `config` of your generator in _generators.yml_.
+
+| Option | Before | Now |
+|--------|--------|-----|
+| `packageManager` | `yarn` | `pnpm` |
+| `testFramework` | `jest` | `vitest` |
+
+