add meta data parsing

[brainelectronics]

Add parser for meta data comment in changelog entry. The parsed data is available via the meta_data property of ExtractVersion after running parse_changelog_completely and is added to the changelog.json file. See #28

• bump snippets2changelog to 1.3.0 to have the snippets meta data added to the changelog entries
• update examples/changelog.json to contain meta data of latest changelog entry

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.62%. Comparing base (e499cd4) to head (8744913).

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #29      +/-   ##
==========================================
+ Coverage   95.16%   95.62%   +0.45%     
==========================================
  Files           3        3              
  Lines         124      137      +13     
  Branches       13       15       +2     
==========================================
+ Hits          118      131      +13     
  Misses          3        3              
  Partials        3        3              

Flag	Coverage Δ
unittests	95.62% <100.00%> (+0.45%)	⬆️

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[brainelectronics]

LGTMself