Recommendation: lock to a contrib-ads major version

[incompl]

Hello there, I'm the primary maintainer for videojs-contrib-ads. Contrib-ads follows semver, and so major version updates are reserved for breaking changes. To assure maximum compatibility for your users, I suggest recommending a specific supported major version of videojs-contrib-ads (for example: 3.x, 4.x, 5.x). To make it even clearer, you could make the project a dependency in your package.json or build it into your built files in dist. Hope this is helpful, thanks for reading!