Also the dub.json: 

{
	"name": "testdir",
	"authors": [
		"t1"
	],
	"dependencies": {
		"vibe-d": "~>0.7.31"
	},
	"description": "A simple vibe.d server application.",
	"copyright": "Copyright © 2017, t1",
	"license": "proprietary",

	"versions": ["VibeDefaultMain"]
}