get rid of snapshot dependencies

[schmir]

lein complains

[dev] [git:master] ~/nozzle/ % lein jar  
Warning: specified :main without including it in :aot. 
Implicit AOT of :main will be removed in Leiningen 3.0.0. 
If you only need AOT for your uberjar, consider adding :aot :all into your
:uberjar profile instead.
Release versions may not depend upon snapshots. 
Freeze snapshots to dated versions or set the LEIN_SNAPSHOTS_IN_RELEASE environment variable to override.