Feature: Adding parameter to create only major version tag

[ruzickap]

Hello.

I'm using the action-update-semver to tag the releases and it works great.
When I create release with tag v1.1.0 it "autocreates" v1, v1.1.

I would like to use this tool to create only one tag v1 for the GitHub Actions.

Like it's described here https://github.com/actions/toolkit/blob/master/docs/action-versioning.md#recommendations - you only need the v1 when tagging v1.1.0 GitHub Actions.

Would it be possible to introduce some new parameter (for example major_version_tag_only) to create only major version tags (v1)? Like:

      - uses: haya14busa/action-update-semver@v1
        with:
          major_version_tag_only: true
          github_token: ${{ secrets.github_token }}

Thank you...

[haya14busa]

LGTM 👍
Can you create a pull-request?

[ruzickap]

PR created - let me know :-)

[haya14busa]

Thank you for your contribution! 💯