update version date to 2019-06-07

Author: greenrobot

objectbox-java/src/main/java/io/objectbox/BoxStore.java

@@ -66,7 +66,7 @@ public class BoxStore implements Closeable {
     /** Change so ReLinker will update native library when using workaround loading. */
     public static final String JNI_VERSION = "2.4.0";
 
-    private static final String VERSION = "2.4.0-2019-05-21";
+    private static final String VERSION = "2.4.0-2019-06-07";
     private static BoxStore defaultStore;
 
     /** Currently used DB dirs with values from {@link #getCanonicalPath(File)}. */