Merge pull request #1628 from samperumal/samperumal/datatable-expansion

Add missing 'expansion' slot TypeScript definition to DataTable.d.ts

src/components/datatable/DataTable.d.ts

@@ -113,6 +113,7 @@ declare class DataTable {
         groupheader: VNode[];
         groupfooter: VNode[];
         loading: VNode[];
+        expansion: VNode[];
     };
 }