md2man: cannot find package

Trying to install:
```bash
go get -u github.com/mlabouardy/nexus-cli
```
Results in:
```
package github.com/cpuguy83/go-md2man/v2/md2man: cannot find package "github.com/cpuguy83/go-md2man/v2/md2man" in any of:
	/usr/local/go/src/github.com/cpuguy83/go-md2man/v2/md2man (from $GOROOT)
	/go/src/github.com/cpuguy83/go-md2man/v2/md2man (from $GOPATH)
```