Use cli v2

[kimusaku]

resolved the compile error that origintes from urfave/cli#925

[codecov-io]

Codecov Report

Merging #58 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #58   +/-   ##
=======================================
  Coverage   72.95%   72.95%           
=======================================
  Files           4        4           
  Lines         318      318           
=======================================
  Hits          232      232           
  Misses         76       76           
  Partials       10       10

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[romanovskyj]

Merged thanks!