Describe the bug
Crates fetched via SSH don't appear to be supported for source checking. I'm not sure if this is a bug or a feature request, but it would be nice for projects that want to deny unknown sources but fetch some dependencies from git with ssh.

To Reproduce

In deny.toml:

[sources]
unknown-git = "deny"
allow-git = [
    "ssh://github.com/organization/project",

This is a tracking issue for additional Store implementations.

Here is a non-exhaustive list of potential candidates for an Store implementation:

• S3Storage:
  This would store crate tarballs and rendered README pages into Amazon's S3.
• RemoteStorage:
  Requires to implement a companion server.
  The idea is to have a reserved folder on another machine which runs a comp

This should work:

cat test.txt | unic-inspector

As nice as it is to be able to remove the blatantly bad stuff, sometimes you don't want the user to be able to enter any HTML at all. You could do this by escaping the markup, but if having a database with < in it doesn't appeal to you, or you're worried about double-escaping or similarly nasty accidents, you could use a function that just tells you if a string has any HTML tags in it. And in