IterRange parses all of the commit messages in the range.

ParseMessage parses a single commit message and returns a slice of the resulting Commit objects.

ParseRange parses all of the commit messages in the range and returns a slice of the resulting Commit objects.

StripComments removes all lines that start with "#" from the input, and returns the resulting string.

Commit represents a single conventional commit.

Footer is a "token: value" or "token #value" pair.