Adding keytar as a dependency

[thinkingserious]

Checklist

• I acknowledge that all my contributions will be made under the project's license

[codecov]

Codecov Report

Merging #55 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #55   +/-   ##
=======================================
  Coverage   99.12%   99.12%           
=======================================
  Files          25       25           
  Lines         687      687           
=======================================
  Hits          681      681           
  Misses          6        6

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