done #46, 完成顶层GET, POST 等方法

[guonaihong]

#46 新增包级别method函数

package main

import (
    "github.com/guonaihong/gout"
)

func main() {
    gout.POST(url).Do()

    gout.GET(url).Do()

    gout.DELETE(url).Do()

    gout.DELETE(url).Do()

    gout.PATCH(url).Do()

    gout.HEAD(url).Do()

    gout.OPTIONS(url).Do()
}