0.7.0 snapshots no-longer exist - use the release.

This crate seems to work fine with 0.7.2 and 0.7.3-SNAPSHOT with just this small change to remove the dependency on pallet 0.7.0-SNAPSHOT, which no-longer exist on sonatype. Installed this locally and all seems fine using the 0.7.0 release instead. I guess it could probably actually use 0.7.2?

Also, minor note - there aren't any published jars for this crate on sonatype that work with the current pallet releases. Is it possible to push out either a snapshot or release that works with 0.7.x?

Thanks!