Add regex to allow single line versions.

[dotmpe]

Regex matching lines starting with digit, followed by
semver allowed characters only.

Enables use of rST definitions lists for main changelog format.

---

See commit msg above. This is my first ruby hack, I cant say I know much about Ruby commit etiquette. Please bear with me.

The additional regex loosens the title prefix/underline requirement a bit. It enables changelogs such as:

https://raw.githubusercontent.com/dotmpe/git-versioning/master/ChangeLog.rst
(https://github.com/dotmpe/git-versioning/blob/master/ChangeLog.rst)

Chandler works like a charm, thanks!

[mattbrictson]

Thanks for the PR! Great to see people using Chandler and helping improve it. 😄

Generally, to accept a PR I need you to provide 2 things:

• A CHANGELOG entry describing the improvement you made
• Tests

If you are comfortable enough with Ruby to successfully run the test suite (just run rake as explained in the CONTRIBUTING.md document), then I think adding a test for this PR should be fairly simple. Add a sample changelog to the test/fixtures/changelog, then write a corresponding test in changelog_test.rb. The existing tests in that file should be self-explanatory; feel free to copy and paste.

If you get stuck, let me know and I can help out. Thanks!

[dotmpe]

That was helpful. Fyi 'bundler' was the only thing missing in ./bin/setup. Tests are running and I'm looking at all the goodies now.

I'll be committing and looking to update PR shortly.

[mattbrictson]

Can you put the Your contribution here! bullet back in? I like to keep in there as a instruction for future contributors.

[mattbrictson]

Excellent! Thanks for the PR! 🙇