Fix/16 move breaking change to body

[woile]

Closes #16

[codecov-io]

Codecov Report

Merging #17 into master will decrease coverage by 0.54%.
The diff coverage is 78%.

@@            Coverage Diff             @@
##           master      #17      +/-   ##
==========================================
- Coverage   77.62%   77.07%   -0.55%     
==========================================
  Files          24       24              
  Lines         505      493      -12     
==========================================
- Hits          392      380      -12     
  Misses        113      113

Impacted Files	Coverage Δ
commitizen/commands/bump.py	16.98% <0%> (ø)	⬆️
commitizen/git.py	29.16% <0%> (-27.36%)	⬇️
commitizen/commands/example.py	100% <100%> (ø)	⬆️
...en/cz/conventional_commits/conventional_commits.py	100% <100%> (ø)	⬆️
commitizen/commands/schema.py	100% <100%> (ø)	⬆️
commitizen/cz/base.py	100% <100%> (+37.2%)	⬆️
commitizen/commands/info.py	100% <100%> (ø)	⬆️
commitizen/commands/commit.py	80% <75%> (-20%)	⬇️
commitizen/cmd.py	66.66% <0%> (-33.34%)	⬇️

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