go-mtree
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update description
From #178 by @compuroot
it might be good to add description (stolen from MTREE(8)) in help section:
DESCRIPTION
The mtree utility compares the file hierarchy rooted in the current
directory against a specification read from the standard input. Messages
are written to the standard output for any files whose characteristics
do not match the specification, or which are missing from either the
file hierarchy or the specification.