lua実装がこれやってたの見ていいなと思ったので

Hi. Thank you for this great plugin! dps-ghosttext.vim helps my Vim life.

I found a conflict with https://github.com/cohama/lexima.vim. dps-ghosttext.vim sets buftype=nofile but lexima.vim doesn't work if buftype=nofile. cf. https://github.com/cohama/lexima.vim/blob/fbc05de53ca98b7f36a82f566db1df49864e58ef/autoload/lexima/insmode.vim#L146-L148

I think there are some choices:

1. Don't use buftype=nofile and use buftype=nowrite instead
2. Add a User autocommand like User dps-ghosttext-open and allow users to customize the ghosttext buffer
3. Change lexima.vim's behavior

I can create a pull request if you are positive the 1. or 2.. Could you please tell me your thoughts?

Best regards.

I'm finding a way to show the GhostText server status on my statusline.
However it seems that there's no such a function in the current code base.
Could you please provide a way to check the server is running or not?