Trying reddit-in-sinatra

Hi there!

Thanks for writing this tutorial.

For some reason, I haven't been able to get this to work on my installation (see attached image). However, wanted to make this minor update to the readme file.

![reddit-in-sinatra error 2013-03-28](https://f.cloud.github.com/assets/3505778/316719/6d84db26-983a-11e2-819c-fef56171d3bd.png)