Before this commit:
$ ./git-validation -run DCO -range HEAD^^..foo
2017/03/21 13:00:30 exit status 128
With this commit:
$ ./git-validation -run DCO -range HEAD^^..foo
ERRO[0000] [git] cmd: "git --no-pager log --no-merges --pretty=format:%H HEAD^^..foo"
2017/03/21 13:16:43 exit status 128
You can get similar output with -D, but folks are unlikely to set that
in production. With the new error logs, Travis output and similar is
more likely to contain some useful information.
Signed-off-by: W. Trevor King <wking@tremily.us>
