Update changelogs from fern repo

fern/products/sdks/overview/typescript/changelog/2025-11-17.mdx

@@ -0,0 +1,22 @@
+## 3.31.0
+**`(feat):`** Add `generateSubpackageExports` configuration option to enable direct imports of subpackage clients. 
+This allows JavaScript bundlers to tree-shake and include only the imported subpackage code, resulting in much smaller bundle sizes.
+
+Example:
+```ts
+import { BarClient } from '@acme/sdk/foo/bar';
+
+const client = new BarClient({...});
+```
+
+To enable this feature, add the following configuration to your _generators.yml_ file:
+```yaml
+# In generators.yml
+groups:
+  generators:
+    - name: fernapi/fern-typescript-sdk
+      config:
+        generateSubpackageExports: true
+```
+
+