如果使用go mod模式，直接安装bee时会报错：
go: github.com/beego/bee imports
github.com/beego/bee/cmd imports
github.com/beego/bee/cmd/commands/dlv imports
github.com/derekparker/delve/service: github.com/derekparker/delve@v1.3.1:
parsing go.mod:
module declares its path as: github.com/go-delve/delve
but was required as: github.com/derekparker/delve
主要参考URL：
http://www.678fly.cn/d/3-go-mod-bee
一、创建一个 go mod 下的文件夹
mkdir test cd test go mod init test
二、在 go.mod 内把 bee 的源替换掉，如下所示：
github.com/realguan/bee 是我 fork 了 github.com/beego/bee 的源码，进行了源代码更改：
module test replace github.com/beego/bee v1.10.0 => github.com/realguan/bee v1.12.1 go 1.12
三、开始正式安装 beego 和 bee
export GOPROXY=https://goproxy.io go get -u github.com/astaxie/beego go get -u github.com/beego/bee
以上如果没报错，那就成功了。
四、接下来测试：
cd test bee new hello // 创建项目 cd src/hello // 进入项目目录 go mod init hello bee run // 大功告成
module demo replace github.com/beego/bee v1.10.0 => github.com/realguan/bee v1.12.1 go 1.13 require ( github.com/astaxie/beego v1.12.0 // indirect github.com/beego/bee v1.10.0 // indirect github.com/cosiner/argv v0.0.1 // indirect github.com/go-delve/delve v1.3.2 // indirect github.com/gorilla/websocket v1.4.1 // indirect github.com/konsorten/go-windows-terminal-sequences v1.0.2 // indirect github.com/lib/pq v1.2.0 // indirect github.com/mattn/go-colorable v0.1.4 // indirect github.com/mattn/go-isatty v0.0.10 // indirect github.com/mattn/go-runewidth v0.0.6 // indirect github.com/peterh/liner v1.1.0 // indirect github.com/shiena/ansicolor v0.0.0-20151119151921-a422bbe96644 // indirect github.com/sirupsen/logrus v1.4.2 // indirect go.starlark.net v0.0.0-20191113183327-aaf7be003892 // indirect golang.org/x/arch v0.0.0-20191101135251-a0d8588395bd // indirect golang.org/x/crypto v0.0.0-20191122220453-ac88ee75c92c // indirect golang.org/x/net v0.0.0-20191125084936-ffdde1057850 // indirect golang.org/x/sys v0.0.0-20191120155948-bd437916bb0e // indirect google.golang.org/appengine v1.6.5 // indirect gopkg.in/yaml.v2 v2.2.7 // indirect )