If you use the copy & paste feature from GH's rendered README.md this
$ sign is also copied and needs to be removed when pasted into a shell.

Removing the $ makes it possible to paste the command w/o manual
edit.

Signed-off-by: Sven Strittmatter <ich@weltraumschaf.de>

Signed-off-by: Sven Strittmatter <ich@weltraumschaf.de>

The documented way to build seems to be outdated:

```
go get github.com/zmap/zgrab2
go: go.mod file not found in current directory or any parent directory.
        'go get' is no longer supported outside a module.
        To build and install a command, use 'go install' with a version,
        like 'go install example.com/cmd@latest'
        For more information, see https://golang.org/doc/go-get-install-deprecation
        or run 'go help get' or 'go help install'.
```

What works for me: Clone the repo and simply run `make` inside the repo
to build the binary.

Signed-off-by: Sven Strittmatter <ich@weltraumschaf.de>