Record TODO-list in README

Signed-off-by: Gustavo L. de M. Chaves <gnustavo@cpan.org>
Let git-change.default-verbose override default verbosity

Signed-off-by: Gustavo L. de M. Chaves <gnustavo@cpan.org>
Only warn about git config when verbose

Signed-off-by: Gustavo L. de M. Chaves <gnustavo@cpan.org>
Implement 'git change setup'

Signed-off-by: Gustavo L. de M. Chaves <gnustavo@cpan.org>