version: parse tag if detecting version

[SeekingMeaning]

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same change?
• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes? Here's an example.
• Have you successfully run brew style with your changes locally?
• Have you successfully run brew tests with your changes locally?

---

Fixes detecting the version from a tag such as v1.2.3-beta1 as 1.2.3 when it should be 1.2.3-beta1

[MikeMcQuaid]

Makes sense to me, thanks again @SeekingMeaning!