chore(package): update ava to version 0.19.1

[make-github-pseudonymous-again]

https://greenkeeper.io/

[codecov-io]

Codecov Report

Merging #61 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master    #61   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           9      9           
  Lines          76     76           
=====================================
  Hits           76     76

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[coveralls]

Coverage remained the same at 100.0% when pulling 68012f8 on greenkeeper/ava-0.19.1 into 7194228 on master.