fix: set default output of chloggen to stdout

[mowies]

Fixes #611

This PR sets the default output for chloggen to stdout as it would be set to stderr otherwise which has all kinds of issues that follow in the usage of the tool downstream.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 51.17%. Comparing base (8865664) to head (84e79fb).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #612      +/-   ##
==========================================
+ Coverage   51.16%   51.17%   +0.01%     
==========================================
  Files          51       51              
  Lines        2881     2882       +1     
==========================================
+ Hits         1474     1475       +1     
  Misses       1260     1260              
  Partials      147      147              

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[mowies]

markdown-link-check is failing because of a regression on their side, nothing that can be fixed here.

[dmathieu]

See #613 for the markdown-lint-check issue.