fix(changelog): sort the commits properly to their version

[woile]

No description provided.

[codecov]

Codecov Report

Merging #181 into master will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #181   +/-   ##
=======================================
  Coverage   91.76%   91.76%           
=======================================
  Files          35       35           
  Lines         947      947           
=======================================
  Hits          869      869           
  Misses         78       78           

Flag	Coverage Δ
#unittests	91.76% <100.00%> (ø)

Impacted Files	Coverage Δ
commitizen/__version__.py	100.00% <100.00%> (ø)
commitizen/commands/changelog.py	90.76% <100.00%> (ø)
commitizen/git.py	95.18% <100.00%> (ø)

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