version bump

Author: jwfing

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

@@ -45,7 +45,7 @@ public interface SchedulerCreator{
   private static retrofit2.Converter.Factory retrofitConverterFactory = converterFactory.generateRetrofitConverterFactory();
   private static JSONParser jsonParser = converterFactory.createJSONParser();
 
-  private static final String SDK_VERSION = "8.1.4";
+  private static final String SDK_VERSION = "8.1.5";
   private static final String DEFAULT_USER_AGENT = "LeanCloud-Java-SDK/" + SDK_VERSION;
 
   public static void setNetworkTimeout(int seconds) {