`get-hostname`: remove unnecessary promise, add max blocking time

src/taoensso/timbre.clj

@@ -250,13 +250,12 @@
 (def ^:private get-hostname
   (encore/memoize* 60000
     (fn []
-      (let [p (promise)]
+      (->
        (future ; Android doesn't like this on the main thread
-          (deliver p
          (try (.. java.net.InetAddress getLocalHost getHostName)
               (catch java.net.UnknownHostException _
-                   "UnknownHost"))))
-        @p))))
+                "UnknownHost")))
+       (deref 5000 "UnknownHost")))))
 
 (defn- wrap-appender-juxt
   "Wraps compile-time appender juxt with additional runtime capabilities