Readme cannot be used as-is

```shell
$ go install github.com/Arachnid/evmdis/evmdis
go: 'go install' requires a version when current directory is not in a module
        Try 'go install github.com/Arachnid/evmdis/evmdis@latest' to install the latest version
```

It needs to be:

```
$ go install github.com/Arachnid/evmdis/evmdis@latest
```

Then it builds and installs.

