Updated leinjacker version.

Updates the leinjacker version to 0.4.1. Without this, I get a crash on using eastwood.

Exception in thread "main" java.lang.AssertionError: Assert failed: (vector? (:dependencies project []))
	at leinjacker.deps$add_if_missing.invoke(deps.clj:43)
	at leiningen.eastwood$eastwood.invoke(eastwood.clj:17)
	at leiningen.eastwood$eastwood.invoke(eastwood.clj:6)