Increase coverage for application.rb

[etagwerker]

This PR adds coverage to test status codes when passing invalid and valid options to the CLI application.

[codecov]

Codecov Report

Merging #31 into master will increase coverage by 15.32%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master      #31       +/-   ##
===========================================
+ Coverage   66.43%   81.75%   +15.32%     
===========================================
  Files          18       19        +1     
  Lines         289      296        +7     
===========================================
+ Hits          192      242       +50     
+ Misses         97       54       -43

Impacted Files	Coverage Δ
test/lib/skunk/cli/commands/compare_test.rb	100% <0%> (ø)
lib/skunk/cli/command_factory.rb	83.33% <0%> (+83.33%)	⬆️
lib/skunk/cli/application.rb	100% <0%> (+100%)	⬆️
lib/skunk.rb	100% <0%> (+100%)	⬆️

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