non-printable characters

[Pierre Peronnet]

Hello everyone,

I got a error message from pass command, so here i the explanation.

## Context

On MacOS, last version from brew:
```
$ pass --version
============================================
= pass: the standard unix password manager =
=                                          =
=                  v1.7.2                  =
=                                          =
=             Jason A. Donenfeld           =
=               Jason at zx2c4.com            =
=                                          =
=      http://www.passwordstore.org/       =
============================================
```

I migrated my password from another password manager which managed my password with some non utf-8 characters.
Then I found that the `pass` displayed `sed: RE error: illegal byte sequence`

Digging more i found that the `tree` does not print some characters, like emojis for example.

## How to reproduce

```
$ pass insert test/🏠
Enter password for test/🏠:
Retype password for test/🏠:
[master cd58096] Add given password for test/🏠 to store.
1 file changed, 0 insertions(+), 0 deletions(-)
create mode 100644 "test/\360\237\217\240.gpg »
```
```
$ pass test
test
sed: RE error: illegal byte sequence
```

## Suggested patch

Use the `-N` parameter for `tree` which allows to force display characters as they are.
We could also use `-q` to replace non-printable characters by `?`.

What do you think about that?

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Pierre Péronnet
pierre.peronnet at gmail.com
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