Clojure 1.9

Lacinia targets Clojure 1.9, and makes specific use of clojure.spec.

To use Lacinia with Clojure 1.8, modify your project.clj to include clojure-future-spec:

:dependencies [[org.clojure/clojure "1.8.0"]
               [com.walmartlabs/lacinia "x.y.z"]
               [clojure-future-spec ""]
               ...]