Updating dependency version numbers to match what's current in clojars

Hi! I had to make these changes to the example project config before I was able to get the example project to run (seems like there's a transitive dependency on com.cemerick:austin:jar:0.1.3 somewhere, which no longer seems to exist). 

I'm also trying to make a sort of "starter template" with chord, but I'm having some trouble moving the example project out from underneath the chord directory itself, if I get that working I might have another pull request forthcoming.