version bump

Author: jwfing

core/src/main/java/cn/leancloud/core/AppConfiguration.java

@@ -37,7 +37,7 @@ public interface SchedulerCreator{
 
   private static boolean enableLocalCache = true;
 
-  private static final String SDK_VERSION = "6.1.9";
+  private static final String SDK_VERSION = "6.2.0";
   private static final String DEFAULT_USER_AGENT = "LeanCloud-Java-SDK/" + SDK_VERSION;
 
   public static void setNetworkTimeout(int seconds) {