Readme out of date

[cognilake]

I pulled your code and was able to get the game to run with lein run. Fun game!
However, when I followed the instructions in the readme, I go the following:

$ lein repl

and get

Exception in thread "main" java.lang.IllegalStateException: Var null/null is unbound. (form-init8976028706982890420.clj:1)
    at clojure.lang.Compiler.eval(Compiler.java:5440)
    at clojure.lang.Compiler.eval(Compiler.java:5415)
    at clojure.lang.Compiler.load(Compiler.java:5857)
    at clojure.lang.Compiler.loadFile(Compiler.java:5820)
    at clojure.main$load_script.invoke(main.clj:221)
    at clojure.main$init_opt.invoke(main.clj:226)
    at clojure.main$initialize.invoke(main.clj:254)
    at clojure.main$null_opt.invoke(main.clj:279)
    at clojure.main$main.doInvoke(main.clj:354)
    at clojure.lang.RestFn.invoke(RestFn.java:422)
    at clojure.lang.Var.invoke(Var.java:369)
    at clojure.lang.AFn.applyToHelper(AFn.java:165)
    at clojure.lang.Var.applyTo(Var.java:482)
    at clojure.main.main(main.java:37)
Caused by: java.lang.IllegalStateException: Var null/null is unbound.
    at clojure.lang.Var.getRoot(Var.java:210)
    at clojure.lang.Var.alterRoot(Var.java:274)
    at clojure.core$alter_var_root.doInvoke(core.clj:4351)
    at clojure.lang.RestFn.invoke(RestFn.java:426)
    at clojure.tools.nrepl.middleware$set_descriptor_BANG_.invoke(middleware.clj:28)
    at blackjack.core$eval991$fn__1002.invoke(form-init8976028706982890420.clj:1)
    at blackjack.core$eval991.invoke(form-init8976028706982890420.clj:1)
    at clojure.lang.Compiler.eval(Compiler.java:5424)
    ... 13 more