Ensure the bump-version script can bump pre-releases

[mcdonnnj]

🗣 Description

This pull request fixes a bug in the logic for checking the prerelease command that prevents one from successfully running ./bump-version prerelease. This resolves #204.

Note

Upon approval of this pull request I will open an equivalent pull request in cisagov/skeleton-packer since it uses the same version management script.

💭 Motivation and context

It is important to be able to bump just the pre-release version.

🧪 Testing

Automated tests pass. I also verified that the command checking logic worked as expected:

$ ./bump-version build prerelease
Changing the prerelease is only allowed in conjunction with the following commands: major minor patch
Update the version of the project.

Usage:
  bump-version [--push] [--label LABEL] (major | minor | patch | prerelease | build | finalize | show)
  bump-version --list-files
  bump-version (-h | --help)

Options:
  -h | --help    Show this message.
  --push         Perform a `git push` after updating the version.
  --label LABEL  Specify the label to use when updating the build or prerelease version.
  --list-files   List the files that will be updated when the version is bumped.
$ ./bump-version finalize prerelease
Changing the prerelease is only allowed in conjunction with the following commands: major minor patch
Update the version of the project.

Usage:
  bump-version [--push] [--label LABEL] (major | minor | patch | prerelease | build | finalize | show)
  bump-version --list-files
  bump-version (-h | --help)

Options:
  -h | --help    Show this message.
  --push         Perform a `git push` after updating the version.
  --label LABEL  Specify the label to use when updating the build or prerelease version.
  --list-files   List the files that will be updated when the version is bumped.
$ ./bump-version major prerelease
Changing version from 0.2.0 to 1.0.0
Changing version from 1.0.0 to 1.0.0-rc.1
$ ./bump-version minor prerelease
Changing version from 1.0.0-rc.1 to 1.1.0
Changing version from 1.1.0 to 1.1.0-rc.1
$ ./bump-version patch prerelease
Changing version from 1.1.0-rc.1 to 1.1.1
Changing version from 1.1.1 to 1.1.1-rc.1
$ ./bump-version prerelease
Changing version from 1.1.1-rc.1 to 1.1.1-rc.2

✅ Pre-approval checklist

• This PR has an informative and human-readable title.
• Changes are limited to a single goal - eschew scope creep!
• All relevant type-of-change labels have been added.
• I have read the CONTRIBUTING document.
• These code changes follow cisagov code standards.
• All new and existing tests pass.

[dav3r]

Thanks for the quick fix on this! 👍