Can't publish: 404 not found
When using skpm publish, it stops just after creating the version tag:

```
⠼ Creating a draft release on GitHub
Error: {
  "message": "Not Found",
  "documentation_url": "https://developer.github.com/v3/repos/releases/#create-a-release",
  "request": {
    "method": "POST",
    "url": "https://api.github.com/repos/dploeger/sketch-plugin-units/releases",
    "headers": {
      "Accept": "application/vnd.github.v3+json",
      "Authorization": "Token **********",
      "User-Agent": "SKPM-Release-Agent"
    },
    "json": {
      "tag_name": "v1.0.0",
      "name": "v1.0.0",
      "draft": true
    }
  }
}
```

I'm not quite sure, why the 404 happens. The URLs used and the tag name is available at the time...