allow no prefix + pass credo

[marinakr]

Contributor checklist

• My commit messages follow the Conventional Commit Message Format
  For example: fix: Multiply by appropriate coefficient, or
  feat(Calculator): Correctly preserve history
  Any explanation or long form information in your commit message should be
  in a separate paragraph, separated by a blank line from the primary message
• Bug fixes include regression tests
• Features include unit/acceptance tests

[sourcelevel-bot]

Ebert has finished reviewing this Pull Request and has found:

• 15 fixed issues! 🎉

You can see more details about this review at https://ebertapp.io/github/zachdaniel/git_ops/pulls/11.

[coveralls]

Pull Request Test Coverage Report for Build 75

• 27 of 32 (84.38%) changed or added relevant lines in 4 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+2.3%) to 87.368%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
lib/mix/tasks/git_ops.release.ex	17	22	77.27%

Totals
Change from base Build 69:	2.3%
Covered Lines:	166
Relevant Lines:	190

---

💛 - Coveralls

[zachdaniel]

I think, purely stylistically, I'd rather see this as:

new_version =
  if prefix != "" do
    String.trim_leading(prefixed_new_version, prefix)
  else
    prefixed_new_version
  end

[zachdaniel]

Thank you so much for all the cleanup you did in addition to this PR. Great stuff! I had one stylistic piece of feedback, but aside from that this looks great. I'll approve/merge once that change is made (or if you disagree with it feel free to discuss).

[zachdaniel]

One more thing, if you could just remove the version change, as well as changes to the changelog. My workflow is to do the release and generate the changelog after merging the PR. Thanks!

[marinakr]

done