feat!: return major/minor/patch when creating GitHub release

[bcoe]

Return major/minor/patch information in output from creating a GitHub release, this can in turn be chained into another action which pushes a tag.

Refs https://github.com/google-github-actions/release-please-action/issues/91

[codecov]

Codecov Report

Merging #642 (3db9f35) into master (ee8ae41) will increase coverage by 0.03%.
The diff coverage is 90.32%.

@@            Coverage Diff             @@
##           master     #642      +/-   ##
==========================================
+ Coverage   81.65%   81.69%   +0.03%     
==========================================
  Files          46       46              
  Lines        5385     5413      +28     
  Branches      437      437              
==========================================
+ Hits         4397     4422      +25     
- Misses        987      990       +3     
  Partials        1        1              

Impacted Files	Coverage Δ
src/github-release.ts	94.05% <90.32%> (-0.77%)	⬇️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update ee8ae41...3db9f35. Read the comment docs.