React Native init specific version

I upgraded my latest project to React Native 0.19 and instantly the video no longer works. How can I create a new project with a specific version? I want to init a new project at version 0.18.1. I did some google searches but couldn't find anything about this.

$ react-native init newproject --verbose

I'm guessing I need to add the word @18.1 in there somewhere but can't get that to work.