chore(package): update chai to version 4.0.1

[arlac77]

No description provided.

[codecov-io]

Codecov Report

Merging #11 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #11   +/-   ##
=======================================
  Coverage   84.39%   84.39%           
=======================================
  Files           1        1           
  Lines         314      314           
=======================================
  Hits          265      265           
  Misses         49       49

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[coveralls]

Coverage remained the same at 84.395% when pulling a0cfb94 on greenkeeper/chai-4.0.1 into 77c1154 on master.