Hi,

I noticed that `git show HEAD:path-to-symlink` does not work and
returns an error like:
"fatal: Path 'debian/changelog' exists on disk, but not in 'HEAD'."

Looking at `git show` it seems there is no way right now to make
git-show show blobs if they are symlinks [1].

It would be nice to have this ability. Attached is a draft patch to
allow to write: `git show --follow-symlinks HEAD:path-to-symlink`.
Tests are missing in the patch, I'm happy to add those if there is a
chance for the feature to get in.

Cheers,
 Michael

[1] Using `git cat-file --follow-symlinks --batch < input` works but
    feels a bit less elegant compared to supporting it directly in
    git-show.