Ignore non-minified bootstrap files

* bootstrap.min.js is already excluded, but bootstrap.js is not.

It seems like this may have been intentional (d5002ef06a9f3463919a3fe8919844c3aea46fc0), though I'm not sure. As it stands, it causes some of my projects (like https://github.com/ChimeraCoder/go-server-bootstrap) to be categorized in correctly).