What's Changed

• Update client.md by @uax in https://github.com/w7corp/easywechat/pull/2608
• 增加API调用说明 by @jwaterwater in https://github.com/w7corp/easywechat/pull/2612
• Update client.md by @jwaterwater in https://github.com/w7corp/easywechat/pull/2613
• 修复应用管理员变更通知判断 by @wjfz in https://github.com/w7corp/easywechat/pull/2617

Full Changelog: https://github.com/w7corp/easywechat/compare/6.9.1...6.9.2