autoperfixer 版本配置

{
	"private": true,
	"dependencies": {
		"autoprefixer": "^9.3.1"
	},
	"browserslist": [
		">1%",
		"ie >8",
		"last 2 versions",
		"iOS >= 7",
		"Android > 4.1",
		"Firefox >= 20",
		"Safari >= 6"
	]
}