reformt release notes for v0.7.1
reformt release notes for v0.7.1

apache/kylin,apache/kylin,apache/incubator-kylin,apache/kylin,apache/incubator-kylin,apache/kylin,apache/incubator-kylin,apache/incubator-kylin,apache/kylin,apache/incubator-kylin,apache/incubator-kylin,apache/kylin,apache/kylin