tp6中新增根空间名

• 在composer.json中新增”support\“: “support”

"autoload": {
    "psr-4": {
        "app\\": "app",
        "support\\": "support"
    },
    "psr-0": {
        "": "extend/"
    }
},

• 添加后续执行以下代码才会生效

  composer dumpautoload