Fix documentation

Signed-off-by: Gustavo L. de M. Chaves <gnustavo@cpan.org>
Show warn when keeping a change branch during a 'backout'

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

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