THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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到https://github.com/apache/incubator-iotdb/releases，找到刚打的release，点击edit tag ，选中 This is a pre-release ,然后 Save draft。
（这是因为“发行版不稳定，要通知用户该版本还不适合投入生产“，所以选择 This is a pre-release（这是预发行版），参考链接：https://help.github.com/cn/github/administering-a-repository/creating-releases）
3.5 写邮件
邮件标题：[VOTE] Apache IoTDB 0.8.1 (incubating) RC2 release
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进入https://repository.apache.org/#welcome，登录账号，然后到Staging Repositories中选中你之前close的版本，选择release。完事儿。
9. github publish release
到https://github.com/apache/incubator-iotdb/releases，把之前this is a pre-release & save draft的改为publish release。
（好像这一步完成后下一步就不用做了，因为此时release分支似乎已经指向了这个版本，请下次的release manager确认这件事吧）
10. 将release分支的代码更新到最新
我们项目中，release分支始终指向最新的发布版本。
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git merge -X theirs release/0.8.1
10. github publish release
到https://github.com/apache/incubator-iotdb/releases，把之前this is a pre-release & save draft的改为publish release。
11. 更新JIRA
Set the released version to "released" and set the "release-date"
Add the next version to the versions.
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