support for other bundler webpack and rollup

[syarul]

test cat dist/build.js | tape-run failed with webpack. The stream freeze once inside @juliangruber/tap-finished.

ref issue #35

[syarul]

closing the issue, since tape-run does work with webpack just need to add

{
  node: {
    fs: 'empty'
  }
},

[juliangruber]

e6ea66c