Issue with GitHub provider (does nothing)

Hi,

I am trying to use the GitHub provider with the following command:

```bash
$  terraformer import github --resources=* --token=ghp_...  --verbose
```

But no file is created and there is no error message so I have no clue what's happening. Any suggestion on how I can troubleshoot this?

```bash
$ terraformer version
Terraformer v0.8.30
```

Cheers,

Tom