fix(types): add ExpansionPanel-s to index

Signed-off-by: Florian-Schoenherr <[email protected]>

Author: Florian-Schoenherr

packages/svelte-materialify/@types/index.d.ts

@@ -35,3 +35,5 @@ export { default as Snackbar } from './Snackbar';
 export { default as TextField } from './TextField';
 export { default as ProgressLinear } from './ProgressLinear';
 export { default as ProgressCircular } from './ProgressCircular';
+export { default as ExpansionPanel } from './ExpansionPanel';
+export { default as ExpansionPanels } from './ExpansionPanels';