Trezor support has been broken since Sept 2018
( https://github.com/rfjakob/gocryptfs/issues/261 ).
Disable trezor.go by renaming to trezor.go.broken.
This keeps "dep" from having to pull in A LOT OF dependencies:
Before:
$ du -sh vendor/
49M vendor/
After:
$ du -sh vendor/
16M vendor/
