@mansona highlighted that prember does not support node < 8 in the following post:
ember-learn/guides-app#402 (comment)
This project depends on the guidemaker project, which in turn has prember as a dependency, so it makes sense to remove node 6 from the engines tag and only support 8+
This PR matches the upstream PR: https://github.com/empress/guidemaker/pull/15
@mansona highlighted that prember does not support node < 8 in the following post: ember-learn/guides-app#402 (comment) This project depends on the guidemaker project, which in turn has prember as a dependency, so it makes sense to remove node 6 from the engines tag and only support 8+