Feature/customize bump

[woile]

No description provided.

[codecov-io]

Codecov Report

Merging #18 into master will decrease coverage by 0.56%.
The diff coverage is 68.18%.

@@            Coverage Diff             @@
##           master      #18      +/-   ##
==========================================
- Coverage   77.68%   77.12%   -0.57%     
==========================================
  Files          24       24              
  Lines         493      507      +14     
==========================================
+ Hits          383      391       +8     
- Misses        110      116       +6

Impacted Files	Coverage Δ
commitizen/cz/base.py	100% <100%> (ø)	⬆️
...en/cz/conventional_commits/conventional_commits.py	100% <100%> (ø)	⬆️
commitizen/__version__.py	100% <100%> (ø)	⬆️
commitizen/defaults.py	100% <100%> (ø)	⬆️
commitizen/bump.py	96.96% <100%> (-0.18%)	⬇️
commitizen/commands/bump.py	16.66% <22.22%> (-0.32%)	⬇️

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