Add changelog generation

[mpanarin]

No description provided.

[codecov]

Codecov Report

Merging #7 (3d7035a) into master (713e71d) will decrease coverage by 27.91%.
The diff coverage is 40.47%.

@@             Coverage Diff             @@
##           master       #7       +/-   ##
===========================================
- Coverage   87.50%   59.58%   -27.92%     
===========================================
  Files           7       15        +8     
  Lines          72      146       +74     
===========================================
+ Hits           63       87       +24     
- Misses          9       59       +50     

Impacted Files	Coverage Δ
lib/Bumper/bumper.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% <ø> (ø)
lib/Hooks/inspect_hooks.ex	100.00% <ø> (ø)
lib/Tasks/changelog.ex	0.00% <0.00%> (ø)
...b/Changelog/Formatters/keepachangelog_formatter.ex	65.00% <65.00%> (ø)
lib/Bumper/files.ex	100.00% <100.00%> (ø)
lib/Changelog/sections.ex	100.00% <100.00%> (ø)
... and 14 more

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