0.6.0(Dec 7, 2018)

[#412] Nacos can support Dubbo service registration discovery and configuration management.
[#388] Cluster name should be provided in the Instance.
[#377] Clean up messy code in Naming module.
[#369] Support instance list persisted on disk.
[#366] findbugs-maven-plugin version.
[#362] The metadata will lost when online or offline instance through web ui.
[#352] Refactoring internationalization Nacos console.
[#278] Nacos docker img.
[#243] optimize the efficiency of integration testing, it’s taking too long now.