Use stderr when git command fails #56
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Previously, when git commands failed, we weren't capturing stderr in the message, leading to un-descriptive errors such as
17:18:10 main.go:82: can't list dirty packages: diffing directory for dirty packages, exit status 128I've noticed myself and have seen it pointed out in other issues (such as #45). By capturing stderr, we'll get more helpful errors such as
17:32:30 main.go:82: can't list dirty packages: diffing directory for dirty packages, exit status 128: fatal: not a git repository (or any of the parent directories): .git