export cosmwasm instruction (#744)

Author: Dev Kalra

governance/xc_governance_sdk_js/src/index.ts

@@ -9,6 +9,7 @@ export {
   SetValidPeriodInstruction,
   RequestGovernanceDataSourceTransferInstruction,
   AuthorizeGovernanceDataSourceTransferInstruction,
+  CosmwasmUpgradeContractInstruction,
   Instruction,
 } from "./instructions";