message: fix(itk-js-cli): Print error information when dockcross initialization fails
diff: @@ -55,6 +55,7 @@ const build = (sourceDir) => {
  stdio: [ 'ignore', output, null ]
  })
  if (dockerCall.status !== 0) {
  + console.error(dockerCall.stderr.toString())
  process.exit(dockerCall.status)
  }
  fs.closeSync(output)
  