V0.4

• Add websocket protocol processing logic and test cases.
• Add broker logic between backend services.
• Update order service logic.

V0.3

• Add gorm library into database connection module.
• Add redis libray into database connection module.
• Implement user signup/signin interface.

V0.2

• Adjust project structure according to go-micro's 3 layers of fabric.
• Improve documentation.

V0.1.1 proto file optimized.

• Optimize proto file defined and modify proto file location.
• Optimize api gateway logic.

V0.1 First runnable version.

基本完成项目基本架构，完成主要的单元测试。