完美解决go mod 下bee无法正常安装的问题
创建一个go mod 下的文件夹
mkdir test
cd test
go mod init test
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
开始正式安装 beego 和 bee
export GOPROXY=https://goproxy.io // 科学上网安装
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。
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
附上 go.mod ：
module test
replace github.com/beego/bee v1.10.0 => github.com/realguan/bee v1.12.1
go 1.12
require (
github.com/astaxie/beego v1.11.1 // indirect
github.com/beego/bee v1.10.0 // indirect
github.com/bradfitz/gomemcache v0.0.0-20190329173943-551aad21a668 // indirect
github.com/casbin/casbin v1.8.2 // indirect
github.com/couchbase/go-couchbase v0.0.0-20190515160915-dcefcb68da4a // indirect
github.com/couchbase/gomemcached v0.0.0-20190515232915-c4b4ca0eb21d // indirect
github.com/couchbase/goutils v0.0.0-20190315194238-f9d42b11473b // indirect
github.com/edsrzf/mmap-go v1.0.0 // indirect
github.com/go-delve/delve v1.2.0 // indirect
github.com/go-redis/redis v6.15.2+incompatible // indirect
github.com/gogo/protobuf v1.2.1 // indirect
github.com/golang/protobuf v1.3.1 // indirect
github.com/golang/snappy v0.0.1 // indirect
github.com/gorilla/websocket v1.4.0 // indirect
github.com/kisielk/errcheck v1.2.0 // indirect
github.com/lib/pq v1.1.1 // indirect
github.com/onsi/ginkgo v1.8.0 // indirect
github.com/onsi/gomega v1.5.0 // indirect
github.com/pelletier/go-toml v1.4.0 // indirect
github.com/pkg/errors v0.8.1 // indirect
github.com/siddontang/ledisdb v0.0.0-20190202134119-8ceb77e66a92 // indirect
github.com/syndtr/goleveldb v1.0.0 // indirect
github.com/wendal/errors v0.0.0-20181209125328-7f31f4b264ec // indirect
golang.org/x/crypto v0.0.0-20190605123033-f99c8df09eb5 // indirect
golang.org/x/net v0.0.0-20190603091049-60506f45cf65 // indirect
golang.org/x/sys v0.0.0-20190602015325-4c4f7f33c9ed // indirect
golang.org/x/text v0.3.2 // indirect
golang.org/x/tools v0.0.0-20190606050223-4d9ae51c2468 // indirect
gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 // indirect
)
