feat: handle multiline bulleted commit messages

[bcoe]

handles multi-line bulleted commit messages.

fixes: #287

[codecov]

Codecov Report

Merging #396 into master will increase coverage by 4.5%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master     #396     +/-   ##
=========================================
+ Coverage   83.03%   87.53%   +4.5%     
=========================================
  Files          13       27     +14     
  Lines        2305     3170    +865     
  Branches      210      240     +30     
=========================================
+ Hits         1914     2775    +861     
- Misses        391      392      +1     
- Partials        0        3      +3

Impacted Files	Coverage Δ
src/util/indent-commit.ts	100% <100%> (ø)
src/release-pr.ts	85.77% <0%> (-4.35%)	⬇️
src/github-release.ts	95.2% <0%> (-2.4%)	⬇️
src/releasers/php-yoshi.ts	91.01% <0%> (-2.35%)	⬇️
src/graphql-to-commits.ts	88.46% <0%> (-1.65%)	⬇️
src/conventional-commits.ts	97.27% <0%> (-0.46%)	⬇️
src/updaters/java/pom-xml.ts	100% <0%> (ø)
src/updaters/java/versions-manifest.ts	100% <0%> (ø)
src/updaters/java/java_update.ts	96.15% <0%> (ø)
src/updaters/terraform/readme.ts	100% <0%> (ø)
... and 12 more

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