Use dev branch for release notes generation

[serboctor]

Modify changelog configuration to generate release notes from PRs created against dev only to avoid duplication.

[codecov[bot]]

Codecov Report

Merging #160 (bf26b04) into dev (27d510e) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev     #160   +/-   ##
=======================================
  Coverage   77.09%   77.09%           
=======================================
  Files          13       13           
  Lines         860      860           
=======================================
  Hits          663      663           
  Misses        152      152           
  Partials       45       45           

Flag	Coverage Δ
unit	77.09% <ø> (ø)

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