[PATCH] protect dirname calls from pass-names that look like command-line options

[Spencer Pearson]

Within an hour of discovering (and falling head over heels for) Pass
yesterday, I typed "pass edit --help", thereby stubbing my toe on the bug
that Stacey Sheldon's patch fixes:
https://lists.zx2c4.com/pipermail/password-store/2017-July/002986.html

I'm pretty sure that this patch is unambiguously good with exactly zero
downsides. I just wanted to ensure it didn't get buried. :)

Best,
-Spencer
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