分页参数基础类，增加排序方式字段

4dkankan-common-utils/src/main/java/com/fdkankan/common/request/RequestBase.java

@@ -14,4 +14,10 @@ public class RequestBase implements Serializable {
     private int start;
 
     private String orderBy;
+
+    /**
+     * DESC-降序
+     * ASC-升序
+     */
+    private String sortBy = "ASC";
 }