feat: major refactor on code structure

[jk1z]

• refactored folder structure
• fix: include MR and issue twice. (Using merged_at and closed_at instead of update_at)
• feat: Tool can be used in CLI

[codecov[bot]]

Codecov Report

Merging #37 (a90b8bd) into master (f0a12e0) will increase coverage by 9.02%. The diff coverage is 93.00%.

@@            Coverage Diff             @@
##           master      #37      +/-   ##
==========================================
+ Coverage   84.16%   93.19%   +9.02%     
==========================================
  Files          12       20       +8     
  Lines         240      338      +98     
  Branches       53       43      -10     
==========================================
+ Hits          202      315     +113     
+ Misses         38       23      -15     

Impacted Files	Coverage Δ
app/repositories/gitlab.js	75.00% <75.00%> (ø)
app/app.js	81.25% <81.25%> (ø)
app/adapters/gitlab.js	87.75% <87.50%> (+4.82%)	:arrow_up:
app/services/tag.js	89.13% <89.13%> (ø)
app/configureContainer.js	100.00% <100.00%> (ø)
app/constants.js	100.00% <100.00%> (ø)
app/decorators/base.js	100.00% <100.00%> (ø)
app/decorators/gitlab.js	100.00% <100.00%> (ø)
app/decorators/index.js	100.00% <100.00%> (ø)
app/decorators/slack.js	100.00% <100.00%> (ø)
... and 11 more

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