0.3.6

• 文档: 补充说明 NamingService 和 ConfigService 需要全局的生命周期
• 优化: 调整 connection health check 日志级别为 warn

• Doc: supplement that NamingService and ConfigService need a global lifecycle #223
• Enhance: adjust the log level of connection health check to warn #223

Full Changelog: https://github.com/nacos-group/nacos-sdk-rust/compare/v0.3.5...v0.3.6