always log to STDERR from datahike.cli (#702)

Co-authored-by: Coby Tamayo <coby@tamayo.email>

src/datahike/cli.clj

@@ -16,6 +16,13 @@
 
 ;; This file is following https://github.com/clojure/tools.cli
 
+(log/merge-config!
+  {:appenders {:println {:doc "Always prints to *err*"
+                         :enabled? true
+                         :fn (fn log-to-stderr [{:keys [output_]}]
+                               (binding [*out* *err*]
+                                 (println (force output_))))}}})
+
 (defn usage [options-summary]
   (->> [datahike-logo
         "This is the Datahike command line interface."