Vim script file is not in syntax highlight filetype list

[othree]

Hi
I am going to give a talk about vim.
And I found vroom can have some slide with syntax highlight.
But it can't highlight vim script file.

I add this line into the $types:

     vim => 'vim',

And every slide will become .vim file.
So I use an alternative name:

     vims => 'vim',

And use vims instead of vim while editing vim slide.
I don't think this is a good solution.
But works for now.
Hope this issue can be solved.

Thanks.