Error trying to assign a non-collaborator to issue

[EliiseS]

Only people who have commented on the issue or are a collaborator can be assigned to a github issue. Right now it fails to assign them, but maybe instead it can add a comment mentioning the person who can't be assigned.

Error:

😱 Something went wrong while migrating issue #153!
{
  "status": 422,
  "json": {
    "message": "Validation Failed",
    "errors": [
      {
        "value": "tmeckel",
        "resource": "Issue",
        "field": "assignees",
        "code": "invalid"
      }
    ],
    "documentation_url": "https://developer.github.com/v3/issues/#create-an-issue"
  }
}

[gabro]

Hey, thanks for reporting!
Just to set the right expectations, I’m not actively maintaining this repo, so I will probably not work on it anything time soon.
I’ll gladly review PRs and release new versions though :)