feature request: Flat directories

Instead of:

```
github.com/user1/repo1
github.com/user1/repo2
github.com/user2/other-repo
```

I would like to have flat directories:

```
github.com/user1--repo1
github.com/user1--repo2
github.com/user2--other-repo
```

or 

```
github.com--user1--repo1
github.com--user1--repo2
github.com--user2--other-repo
```


Less bloated. Clean. Easier to explore large list of repos