Merge branches 'feature/20200421_申请退款任务_wuping' and 'master' of http://gitlab.freemud.com/order-group-application/order-group

# Conflicts:
#	assortment-ordercenter-sdk/pom.xml
#	assortment-ordercenter-sdk/readme.md
#	assortment-ordercenter-sdk/src/main/java/com/freemud/sdk/api/assortment/order/service/order/OrderCenterSdkServiceImpl.java
#	order-application-service/pom.xml
#	order-application-service/src/main/java/cn/freemud/service/impl/OrderServiceImpl.java
#	ordercenter-sdk/pom.xml
#	ordercenter-sdk/readme.md
#	ordercenter-sdk/src/main/java/com/freemud/application/sdk/api/ordercenter/request/OrderCancelReq.java