Adopt modern packaging

[yakky]

• bumpversion
• towncrier
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Fix #362 Fix #363 Fix #364

[codecov[bot]]

Codecov Report

Merging #370 into develop will increase coverage by 0.17%. The diff coverage is 94.09%.

@@             Coverage Diff             @@
##           develop     #370      +/-   ##
===========================================
+ Coverage    92.78%   92.96%   +0.17%     
===========================================
  Files            7        7              
  Lines          610      597      -13     
  Branches       121      121              
===========================================
- Hits           566      555      -11     
+ Misses          17       15       -2     
  Partials        27       27              

Flag	Coverage Δ
#unittests	92.96% <94.09%> (?)

Impacted Files	Coverage Δ
djangocms_installer/config/internal.py	86.20% <42.85%> (-0.46%)	:arrow_down:
djangocms_installer/config/ini.py	90.41% <91.66%> (+2.09%)	:arrow_up:
djangocms_installer/config/__init__.py	91.82% <91.95%> (-0.11%)	:arrow_down:
djangocms_installer/install/__init__.py	95.34% <94.11%> (-0.11%)	:arrow_down:
djangocms_installer/django/__init__.py	92.48% <98.24%> (-0.07%)	:arrow_down:
djangocms_installer/config/data.py	100.00% <100.00%> (ø)
djangocms_installer/utils.py	100.00% <100.00%> (ø)

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[yakky]

replaced by #373