Copied from https://github.com/jenkinsci/pipeline-github-plugin/issues/88

Getting `org.eclipse.egit.github.core.client.RequestException: Validation Failed (422): line required and an integer greater than zero`
The method documentation has a lineNumber parameter (https://github.com/jenkinsci/pipeline-github-plugin#adding-a-review-comment)

while the code(https://github.com/jenkinsci/pipeline-github-plugin/blob/master/src/main/java/org/jenkinsci/plugins/pipeline/github/PullRequestGroovyObject.java#L676-L679) has a position parameter and it needs both by GitHb Api Documentation (https://developer.github.com/v3/pulls/comments/#create-a-review-comment-for-a-pull-request).

There's a fix (https://github.com/tomasbjerre/violation-comments-to-github-lib/pull/9/files#) to a similar problem