CLOUDESL SDK Auto Released By shujin.lk,Version：1.51.21

Signed-off-by: haowei.yao <haowei.yao@alibaba-inc.com>

ChangeLog.txt

@@ -1,3 +1,6 @@
+2019-01-30 Version: 1.51.21
+1, Add a new pop interface to support deleting item by skuId which is defined by users to distinguish items
+
 2019-01-30 Version: 1.51.20
 1, Add a new pop interface to support deleting item by skuId which is defined by users to distinguish items