message: fix win32 issue
  shasum is a perl script, ignore it
  windows don't exist /dev/null
diff: @@ -47,7 +47,7 @@ export async function fetchNodeBinary({nodeVersion, output, platform, arch, tmp}
  const basedir = path.dirname(tarball)
  await qq.mkdirp(basedir)
  await qq.download(url, tarball)
  - await qq.x(`grep "${path.basename(tarball)}" "${shasums}" | shasum -a 256 -c -`, {cwd: basedir})
  + if (platform !== 'win32') await qq.x(`grep "${path.basename(tarball)}" "${shasums}" | shasum -a 256 -c -`, {cwd: basedir})
  }
  const extract = async () => {
  @@ -58,7 +58,7 @@ export async function fetchNodeBinary({nodeVersion, output, platform, arch, tmp}
  await qq.mkdirp(path.dirname(cache))
  if (platform === 'win32') {
  qq.pushd(nodeTmp)
  - await qq.x(`7z x -bd -y "${tarball}" > /dev/null`)
  + await qq.x(`7z x -bd -y "${tarball}"`)
  await qq.mv([nodeBase, 'node.exe'], cache)
  qq.popd()
  } else {
  