chore: release 4.0.0

[bcoe]

🤖 I have created a release *beep* *boop*

4.0.0 (2019-10-17)

⚠ BREAKING CHANGES

• allow leading slashes in file name (fix!: allow leading slashes in file name #820)

Bug Fixes

• allow leading slashes in file name (#820) (92e115d)
• deps: update hash-stream-validation (#884) (96a7fc2)

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This PR was generated with Release Please.

[codecov]

Codecov Report

Merging #886 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #886   +/-   ##
=======================================
  Coverage   95.36%   95.36%           
=======================================
  Files          11       11           
  Lines        1230     1230           
  Branches      307      307           
=======================================
  Hits         1173     1173           
  Misses         29       29           
  Partials       28       28

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