Example does not work, Tengo cannot deal with shebang

`cat hw.tengo`:

```
#!/data/overflow/go/bin/tengo
fmt := import("fmt")
fmt.println("Hello World!")
```

`chmod +x hw.tengo./hw.tengo`:

```
Parse Error: illegal character U+0023 '#'
        at hw.tengo:1:1
```

(Also `go get github.com/d5/tengo/cmd/tengo` no longer works to install, it should be `go install github.com/d5/tengo/cmd/tengo`)