Follow-up from https://github.com/dart-lang/pana/issues/459#issuecomment-446965694, it would be cool to tag packages that lint cleanly with [style `pedantic`](https://github.com/dart-lang/pedantic/) in the publang "analysis" tab. Maybe something like the badge we're using in the linter [rule docs](http://dart-lang.github.io/linter/lints/avoid_empty_else.html)?:  /cc @davidmorgan