Add a bit more of a call to action in the README
Add a bit more of a call to action in the README

If this is going to be public, let's not just say "this is new and scary
and you shouldn't come near it". More contributors would be awesome.

diesel-rs/diesel,cascalheira/diesel,sgrif/diesel,mcasper/diesel,SoftwareWarlock/diesel,cascalheira/diesel,tohou/diesel,diesel-rs/diesel,tohou/diesel,SoftwareWarlock/diesel,mcasper/diesel,sgrif/diesel