An option to suppress output

[Justinas Stankevičius]

In various cases, output from running migrations is not wanted, particularly when using goose as a library. Ideally, there should be option to "silence" the verbose output from migrations.

This could probably mean migrating to log from fmt. That would allow to set the output to either /dev/null or stdout upon request.

[Liam Staskawicz]

Yep - this makes sense. Not sure I'll get to it immediately myself, but would be open to including this.