Allow adding changelog to tag

[mpanarin]

closes #14

[codecov]

Codecov Report

Base: 56.77% // Head: 55.67% // Decreases project coverage by -1.09% ⚠️

Coverage data is based on head (f1047d4) compared to base (be07075).
Patch coverage: 62.50% of modified lines in pull request are covered.

❗ Current head f1047d4 differs from pull request most recent head fadf1bb. Consider uploading reports for the commit fadf1bb to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #16      +/-   ##
==========================================
- Coverage   56.77%   55.67%   -1.10%     
==========================================
  Files          15       17       +2     
  Lines         155      185      +30     
==========================================
+ Hits           88      103      +15     
- Misses         67       82      +15     

Impacted Files	Coverage Δ
lib/Bumper/files.ex	100.00% <ø> (ø)
lib/Changelog/DataGrabbers/git_datagrabber.ex	0.00% <0.00%> (ø)
lib/Git/commands.ex	0.00% <0.00%> (ø)
lib/Hooks/changelog_hooks.ex	0.00% <0.00%> (ø)
lib/Hooks/git_hooks.ex	0.00% <0.00%> (ø)
lib/Tasks/changelog.ex	0.00% <0.00%> (ø)
lib/Utils/ok_monad.ex	100.00% <ø> (ø)
lib/Utils/utils.ex	100.00% <ø> (ø)
lib/Bumper/bumper.ex	97.56% <100.00%> (-2.44%)	⬇️
lib/Changelog/DataGrabbers/version.ex	100.00% <100.00%> (ø)
... and 10 more

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