feat: Expose release count option

[lucahuettner]

Hey, thanks for the fork it offers really useful additions to standard-version!

One feature that is missing for us is that we can't regenerate the complete changelog since the releaseCount option isn't passed through to conventional-changelog so I added it with this PR. If you have any feedback on it feel free to share.

Hope we can make it an addition to the package since also other people seem to miss it as well (Fixes conventional-changelog#719)

[lucahuettner]

Extension:
Since releaseCount = 0 regenerates the complete changelog but still gets added to the old changelog it might be good to also have an option to regenerate the changelog without appending it to the old one. Or have an extra option to ignore the old changelog which could be combined with releaseCount = 0 to regenerate the complete changelog. This would also be helpful to us and I would be happy to implement it as well.

[TimothyJones]

This is awesome, thank you!

I can definitely accept this. A couple of requests:

1. Would it be possible to add a test or two? I think this file would be a good place to look for a pattern- there are mocks and expected changelogs there.

2. Could you add the option to the readme too?

And a question:

3. I agree with @lucahuettner that releaseCount = 0 appending the whole changelog is probably unexpected - I can't think of a use case for that. Should we instead replace the whole changelog when releaseCount is 0? (Adding an option to control this would give the most configurability, but I'm not wild about expanding the API surface when I can't see a use case for controlling it) Thoughts?

[lucahuettner]

Yes I will take a look at the tests and add the option to the readme. And I also agree with you on the 3rd point, I will implement this as well.

[lucahuettner]

I have added documentation about the option to the readme and have added that the changelog gets overridden when releaseCount is 0.

But unfortunately, I couldn't figure out how to test the changelog regeneration.

[TimothyJones]

I'll get this in on Monday, and see if I can add a test. Either way, I'll release it then.

Thanks again for the PR! Much appreciated <3

[codecov-commenter]

Codecov Report

Merging #53 (6dfde4e) into master (7fbc106) will not change coverage.
The diff coverage is 100.00%.

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@@           Coverage Diff           @@
##           master      #53   +/-   ##
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  Coverage   97.40%   97.40%           
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  Files          27       27           
  Lines        1194     1194           
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  Hits         1163     1163           
  Misses         31       31           

Impacted Files	Coverage Δ
command.js	84.61% <ø> (ø)
defaults.js	100.00% <ø> (ø)
lib/lifecycles/changelog.js	100.00% <100.00%> (ø)

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[lucahuettner]

Okay sounds great :)

[TimothyJones]

Released as 11.1.0. Please let me know if there are any issues, and thanks again for the PR!