message: Use cosmwasm_vm::testing::MOCK_CONTRACT_ADDR
diff: @@ -23,7 +23,10 @@ use cosmwasm_std::{
  };
  use cosmwasm_vm::{
  from_slice,
  - testing::{handle, init, mock_env, mock_instance, mock_instance_with_balances, query, test_io},
  + testing::{
  + handle, init, mock_env, mock_instance, mock_instance_with_balances, query, test_io,
  + MOCK_CONTRACT_ADDR,
  + },
  Api, ReadonlyStorage,
  };
  @@ -158,7 +161,7 @@ fn handle_release_works() {
  assert_eq!(
  msg,
  &BankMsg::Send {
  - from_address: HumanAddr("cosmos2contract".to_string()),
  + from_address: HumanAddr::from(MOCK_CONTRACT_ADDR),
  to_address: beneficiary,
  amount: coins(1000, "earth"),
  }
  