Update tar-stream to the latest version 🚀

[greenkeeper[bot]]

The optionalDependency tar-stream was updated from 1.6.2 to 2.0.0.

This version is not covered by your current version range.

If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update.

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There is a collection of [frequently asked questions](https://greenkeeper.io/faq.html). If those don’t help, you can always [ask the humans behind Greenkeeper](https://github.com/greenkeeperio/greenkeeper/issues/new).

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Your Greenkeeper bot :palm_tree:

[codecov[bot]]

Codecov Report

Merging #25 into master will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #25   +/-   ##
=======================================
  Coverage   77.17%   77.17%           
=======================================
  Files           3        3           
  Lines          92       92           
  Branches       14       14           
=======================================
  Hits           71       71           
  Misses         21       21

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