Merge branch 'feat-oemvip' into test

UPGRADE_2.x.md

+# 2.0.52
+- 预约功能优化上线
+
 # 2.0.51
 - 添加配置中心常量
 

src/Vip/Enum/VipEnum.php

@@ -27,4 +27,7 @@ class VipEnum
 	const VIP_TYPE_NORMAL = "1"; //普通
 
 	const VIP_TYPE_TRY = "2";//试用
+
+	const IS_DISTRIBUTION_ON = 1;//开启分销
+	const IS_DISTRIBUTION_OFF = 0;//关闭分销
 }
\ No newline at end of file