bugfix: use clojure < 1.7 update-in syntax

By report, this is still causing problems with Boot installations that don't use Clojure 1.7 by default. At least for the time being, it's safer to use the pre-Clojure 1.7 `update-in` syntax instead of the slightly-more-concise Clojure 1.6 `update` syntax, in order to avoid compatibility issues.

Author: daveyarwood

src/alda/now.clj

@@ -13,7 +13,7 @@
     events
     (let [earliest (apply min (map :offset events))]
       (into #{}
-        (map #(update % :offset - earliest) events)))))
+        (map #(update-in % [:offset] - earliest) events)))))
 
 (defn play-new-events!
   [events]

src/alda/version.clj

@@ -1,4 +1,4 @@
 (ns alda.version)
 
-(def ^:const -version- "0.4.3")
+(def ^:const -version- "0.4.4")