const {
  Contracts,
  SimpleProject,
  ZWeb3,
  encodeCall
} = require('zos-lib')

const data = encodeCall(
  'addOwner',
  ['address'],
  ['0xaca94ef8bd5ffee41947b4585a84bda5a3d3da6e']
)

await owners.submitTransaction(owners.address, 0, data, {
  from: accounts[0]
})