Change delegate type to string (#73)

Author: 0xIchigo

src/types/das-types.ts

@@ -71,7 +71,7 @@ export interface SearchAssetsRequest {
   supplyMint?: string;
   supply?: number;
   interface?: string;
-  delegate?: number;
+  delegate?: string;
   ownerType?: OwnershipModel;
   royaltyAmount?: number;
   royaltyTarget?: string;