add code cid to stateReadState output

api/api_full.go

@@ -650,6 +650,7 @@ type Message struct {
 
 type ActorState struct {
 	Balance types.BigInt
+	Code    cid.Cid
 	State   interface{}
 }
 

node/impl/full/state.go

@@ -473,6 +473,7 @@ func (a *StateAPI) StateReadState(ctx context.Context, actor address.Address, ts
 
 	return &api.ActorState{
 		Balance: act.Balance,
+		Code:    act.Code,
 		State:   oif,
 	}, nil
 }