Fix/test bump and refactor changelog

[woile]

Types of changes

• Bug fix
• New feature
• Refactoring
• Breaking change (any change that would cause existing functionality to not work as expected)
• Documentation update
• Other (please describe)

Description

• removed english text in bump test
• removed dependency on pkg_resources by using jinja functions

[codecov]

Codecov Report

Merging #231 into master will not change coverage.
The diff coverage is 40.00%.

@@           Coverage Diff           @@
##           master     #231   +/-   ##
=======================================
  Coverage   95.70%   95.70%           
=======================================
  Files          34       34           
  Lines         955      955           
=======================================
  Hits          914      914           
  Misses         41       41           

Flag	Coverage Δ
#unittests	95.70% <40.00%> (ø)

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Impacted Files	Coverage Δ
commitizen/commands/bump.py	90.58% <25.00%> (ø)
commitizen/__version__.py	100.00% <100.00%> (ø)

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