Hey, I like me a pessimistic version constraint, too, but it wouldn't work in this case, and I thought actually permitting working versions more important than specifying `~> 2.0`.  

@mvz re:  [`~> 2.0.0` you know that's `2.0.x where x >= 0`](http://www.benjaminfleischer.com/2013/08/21/psa-gem-versions/), right? (Remember https://github.com/troessner/reek/pull/187 )