Added linked action to export

Author: rg911

src/model/model.ts

@@ -77,6 +77,7 @@ export * from './transaction/Deadline';
 export * from './transaction/HashLockTransaction';
 export * from './transaction/HashType';
 export * from './transaction/InnerTransaction';
+export * from './transaction/LinkAction';
 export * from './transaction/LockFundsTransaction';
 export * from './transaction/Message';
 export * from './transaction/ModifyMultisigAccountTransaction';