Only output is `Bus error: 10`

### What happened?

Run it on my xcodeproj and only get the following output:

```
$ dependency-graph /Users/.../SomeProject.xcodeproj
Bus error: 10
```

### What are the steps to reproduce?

```
$ dependency-graph --version
1.2.0
```

Run with ".xcodeproj"

### What is the expected behavior?

Generate the dependency tree in DOT-syntax