Feature: be able to use fixed version

[ivanmarban]

Thanks for making this great action! I found it very useful but I miss "more control" over the version instead of being calculated automatically.

Maybe the action could have a new command option fixed for example and version then will accept the fixed semver string.

- name: update changelog
  uses: release-flow/keep-a-changelog-action@v2
  with:
    command: fixed
    version: 1.0.0-rc.1
    tag-prefix: v
    changelog: CHANGELOG.md
    keep-unreleased-section: true

[richtea]

Hi @ivanmarban , glad you're finding it useful. I think your suggestion is a good one - there's nothing wrong with doing something manually if you need the control! I'll keep this feature on the backlog here - a PR would be very welcome, alternatively I will take a look once I've finished the feature I'm currently working on.