Hi!

Thanks for making such a neat tool to do stacked PRs. I'm really enjoying using it.

One thing that is confusing though is that there is often a stacktrace that gets printed out when a git command (for example) fails "normally" -- for example, if I don't stage any files before running git spr amend.

In this situation, it seems the stack trace isn't really helpful since there isn't a bug in spr, and the information message I really need to read is the output from the git command, which gets pushed up by the stack trace.

Would there be a way for this to not output a stack trace, and print it when supplying the --verbose flag? Or, failing that, can I have it so that I can suppress the stack traces with an environment variable?