Remove remaining of old block of code in README

After @MarcWeber last commit, we have this. I'm not sure if the last part can be removed. If not, please close this.

```vim
let g:snipMate = {}
let g:snipMate.scope_aliases = {}
let g:snipMate.scope_aliases['ruby'] = 'ruby,ruby-rails,ruby-1.9'
```

            \ 'ruby'    : {'filetypes': ["ruby", "ruby-rails", "ruby-1.9"] },
```

As you can see it's interpreting this comment as block of code