launch.json

{
    //Xdebug with php 7.1 setup
    "version": "0.2.0",
    "configurations": [

        {
            "name": "Listen for XDebug",
            "type": "php",
            "request": "launch",
            "port": 9000,
            "serverSourceRoot": "/home/vagrant/Code/blackhole-todo",
            "localSourceRoot": "/home/kmaxat/PhpstormProjects/blackhole-todo"
        }
    ]
}

serverSourceRoot and localSourceRoot are deprecated. Use pathMappings instead. Like so :)

        {
            "name": "Listen for XDebug on Homestead",
            "type": "php",
            "request": "launch",
            "pathMappings": {
                "/home/vagrant/braunson": "~/Documents/GitHub/braunson"
            },
            "port": 9000
        }