Don't redirect Lein error stream

Somewhere in the last 10 years, Lein has started warning about the
$CLASSPATH environment variable being set. If we redirect stderr into
stdout, that warning will be the first item in the process output,
rather than the classpath we're looking for.

Author: eerohele

src/clooj/repl/lein.clj

@@ -65,7 +65,7 @@
   [project-path cmd]
   (->
     (doto (ProcessBuilder. ["lein" cmd])
-      (.redirectErrorStream true)
+      (.redirectErrorStream false)
       (.directory (io/file (or project-path "."))))
     .start))