Use a single prompt for the semver version type when there is only a single package

[emmatown]

Closes #98

[changeset-bot]

🦋 Changeset is good to go

Latest commit: dc1ab43

We got this.

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[codecov]

Codecov Report

Merging #278 into master will decrease coverage by 0.13%.
The diff coverage is 64.44%.

@@            Coverage Diff             @@
##           master     #278      +/-   ##
==========================================
- Coverage   80.09%   79.96%   -0.14%     
==========================================
  Files          45       45              
  Lines        1206     1218      +12     
  Branches      278      282       +4     
==========================================
+ Hits          966      974       +8     
- Misses        229      233       +4     
  Partials       11       11

Impacted Files	Coverage Δ
packages/cli/src/utils/cli-utilities.ts	21.73% <ø> (ø)	⬆️
packages/cli/src/commands/add/index.ts	79.31% <100%> (+0.73%)	⬆️
packages/cli/src/commands/add/messages.ts	94.11% <100%> (+6.61%)	⬆️
packages/cli/src/commands/add/createChangeset.ts	59.42% <57.89%> (-1.6%)	⬇️

---

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 0e8d10c...dc1ab43. Read the comment docs.