v0.11.0

New --punctuation always|auto|never message style option controls terminal
punctuation in commit messages. always ends the subject and every body
sentence with a period, never adds none and drops trailing periods, and auto,
the default, matches the repository's convention. Replaces --no-period, which
only covered the subject.

The eval suite checks the setting holds: the style flags case now runs with
--punctuation always and asserts every subject ends with a period.