The goal of this comment is to explain when this `= 2.0.3` restriction can be removed. That is, at some point a developer will notice that the capybara that this is tested against is out of date, and will look to see why and whether they can upgrade.

I'm on board with either a comment like this or a detailed commit message. Putting notes like this in the README doesn't make a ton of sense for the end user and is more likely to be overlooked by a developer.