misc/news.bash: generalize the script

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (6a6f927) 85.25% compared to head (ed36fd1) 85.25%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #3877 +/- ## ======================================= Coverage 85.25% 85.25% ======================================= Files 230 230 Lines 55502 55502 ======================================= Hits 47320 47320 Misses 8182 8182 ```

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